Rewterz Threat Alert – Ursnif Distributed Through Reply-Chain Attacks to Look Legitimate

Severity

High

Analysis Summary

Ursnif is being distributed using Reply-Chain attacks and password protected .zip files across multiple clients. Inside of the .zip files will be documents containing macros which execute and reach out to a Ursnif distribution server to download the payload.

The Reply-Chain attacks are carried out by infecting one victim, accessing their emails, locating an ongoing email chain, and then injecting their malicious file into the email chain. This is very effective, because it appears to come from a trusted source.

Additionally, Ursnif demonstrates some fileless capabilities. It installs itself in a Registry Key which will contain powerscript/mshta commands in order to pull down and re-execute itself. As everything else is done in memory, the file is not resident on the HDD, but instead exists in the Registry.

Impact

• Information Theft
• Credential Theft

Indicators of Compromise

Domain Name

• ztoy[.]top
• sizfjalenk51[.]com
• v25brigittet[.]com
• k23ueugeniay[.]com
• qmiller[.]club
• bepkristagrant[.]top
• vipresleynz[.]com
• jt23932[.]xyz
• jecdkeay[.]com

Hostname

• ww2[.]vipresleynz[.]com
• ww3[.]vipresleynz[.]com
• ww4[.]vipresleynz[.]com

SH256

• a066cf151d234f9adf814390295084a96cb50adfdc4b7fb513ecd9c0cf9e0450
• 26452b3a29c72e59201508f944393bd80269a845853dbb43b2cf378ecc9562eb
• 4357f07f5f3c1538212c607f0dab348274270bc9db458e22020b3d36741ad7dc
• 77bccfc252dcf4ace4243f15e73f396a01a9d6c4b1ea533b5c45a2c399ca0948
• d1c95a48e268f0421dca29f80d630d48d581c08c184e31c5604e8acb982f3111
• eb28767989e946cd0d7395e2164a5269c2f9a8185936367dd90047cbeb3778e1
• 22a0ce688275851d810b8ea930bcdfb9e5e2fa78c7814d6f07f6dc104bea055f
• 23e51ff862fa08c2bbb969eb4fa78ebd28dc07f55b90ab2433fa2078ac3a8ca4
• 23e70bda780d04bc3f94b7d58918f96e3d89153e6c44b9658589f4bcb0bb4d04
• 46012e839c34e9d75f0aea81cb1e244167a954470dea09c9299c5af0d0d26f5e
• 4cabf52beeb0818c1965b33dce4e8703c80c1347e6a252218d1fbba8590bd6f7
• 6968f026d732878c997d26ae55d3429952f1d6f7cb07b6ff6d1a4a99c4035498
• 86e1eed479af35827e6287eb319e49d404edbe76631503337381357832c2b8b4
• a7683dd18109b63e5b2365da1f64ec4d436a66857f48f4f7fe78fb01b5c901bd
• c4234865023f7c6dd8f5a8c3c2d73295c2f9119314f90afeda3b110548db0810
• ff1f4197de5db64bc8228d3197c8936813a733488445c73dea441d2abdd64e94

Source IP

• 194[.]87[.]146[.]138
• 200[.]63[.]47[.]3
• 162[.]218[.]210[.]178

URL

• http[:]//v25brigittet[.]com/images/FaQ55z3K_2FGIz9mghFXGxY/XDRZdpWTAS/9ahnn5BzLR5PpDpAm/WiKZ6aYR4_2B/S0 UCb4onYzq/DL2_2FAbc9UhQP/k9yOAnyDaKbAUY6Yrt0NU/FlKtTIMZCIxNM7TJ/ibGnkcgQ0GV88Yt/UfAM8WmF/GWpPzth5/D[.]avi
• http[:]//bepkristagrant[.]top/ https[:]//bepkristagrant[.]top/
• http[:]//jt23932[.]xyz http[:]//jt23932[.]xyz/
• http[:]//jt23932[.]xyz/favicon[.]ico http[:]//jt23932[.]xyz/images/
• http[:]//jt23932[.]xyz/images/9LYWeKMmRFjkUr/2yEx9G126aQqnujMKQcBo/uQ1ikRI4VnE6cmVy/Anr9O2xeyvVnGvs/J_2F 46IQ79Fnea4bBU/9ectIYcH4/uo1XoZZ_2FmbOeRh8REh/2m3UW3njmnm1zzkFkiS/IX9kEhoZhlfc8nV8Ad/vPJN[.]avi
• http[:]//jt23932[.]xyz/images/RxDlsYgPclDm/mqmfEqzqKjU/39Ncxb9eU0fl7o/C9mvjBZY8EQB642Km8m9f/2Tqq5gBcd8pI Oh4b/4Oppw4YTExA09jl/CgKC56zy3uZnhPlyyZ/zYsloLWl_/2Bsf_2Bk0oF6aNCywlqo/T52icgZkU/rmhHg0I2/g[.]avi
• http[:]//jt23932[.]xyz/images/SR9KKK9mDa/CYAQnUAntVJznUnXf/_2BQdkCeNpg_/2FpewJelxLV/g2EQ8hDWhaWF55/142G XtoTK1rHMk7boir1U/g_2F4DD4XgzUQ3dt/muqK8hz3FPasq7P/nMoP8m8We53yEvHTFZ/uY9PHuk47/XmNdOf_2ByIAx/go[.] avi
• http[:]//jt23932[.]xyz/images/btttd1nc5u7m1gfwri5db7s/ql9d4zkjfc/zhqmgkovvs3xxqiug/0tzfayrhzta6/3dlaujahlvf/7h3j9 xflc5wwvk/8kcy4y5kcfojjg7emmrbc/paxmnq9zlq5vroke/wccywxnn8fihgoi/2zrbq74sa/xi[.]avi
• http[:]//jt23932[.]xyz/images/ebwNxFNQkj_2F/dEGrQ8o2/foqH3x_2FKtoXInps4FKDqa/AVLOqWZ41t/kyDBJQ8z31DYibt99/ p8e3aLUvVXBS/tj7eMTvVhzH/BdjW2jkFXH05ES/aUg6n_2BsUr_2F_2Bf4Kt/bab0tY_2FFXAw7Do/LDPJCc65/fiZ8g8Ii/Q[.]avi
• http[:]//jt23932[.]xyz/images/hPGryY8pEOstgn/jz3kf_2FjvCIp3FqvnPlh/Ss_2FxBEGREbS9bf/ODC7dYy12zmlbsb/XW8tV0T 7M1VuyTx5Ce/07ZYk52q0/CDkE8F4rqVVw53JiOv43/Sl2ZdbWokdCgTERFrU7/KDcIlBMftn/diUqR0bpy/EB5[.]avi
• http[:]//jt23932[.]xyz/images/lzUeA7sRaDrQrPuB_2F/DJCz2MoH33d6BseYeU7a5X/UutSJOG_2Bp2l/1NmApyF4/XLD3PiHkk WnqobusQwka7_2/BY9WJhOHsd/fgqsXortDMWtUI8cD/FirgP_2FpHB2/mBNQ0ByNfwB/svz0ej7L_2BfO9/8OEcl8_2FcHn/v[.] avi
• http[:]//jt23932[.]xyz/images/qspMCJDXidt_/2BCIImd5R9M/m9GqPIJz3CkizN/HMFLLfFpR2ta8pSkKO4Tv/f4stJe_2B5wODbg A/j5IyDrqcGwuv0Xk/Mig8no2z2aqitDPuhH/sCsO7wnfp/NeDw2yDY_2F6nAuOHTtG/hMgAzVpxzRnkhe5/Rklix[.]avi http[:]//vipresleynz[.]com/
• http[:]//vipresleynz[.]com/images/X7LDnOaa7nZFoOROAJ/VoZbaW4tF/gZO12QOrj_2B0vhCYjTm/KXyTJ0qbSF1AUPJsMHD/ b5T_2BUXIgrmgsrNtsIbxY/dmHcPDAuaOFSb/WTnpLzYo/gM_2Fo9_2BToboDQjt9cscc/jNC_2FiSnm/McvIhXuDY0M
• http[:]//vipresleynz[.]com/images/lc5W4GeK5/pMcTTKyonUlk0TlYataQ/9Cpm8IXUiZvRl2NPeOm/pDjk2I7uTIJvOqDSADYo6 a/cw1B2ZsSzPkya/rY2HLtCg/CE6XyqTO8jGNiv_2B4GIkvv/81qVnJvFBv/WnIuEM5L0qYzefsJx
• http[:]//vipresleynz[.]com/images/lc5W4GeK5/pMcTTKyonUlk0TlYataQ/9Cpm8IXUiZvRl2NPeOm/pDjk2I7uTIJvOqDSADYo6 a/cw1B2ZsSzPkya/rY2HLtCg/CE6XyqTO8jGNiv_2B4GIkvv/81qVnJvFBv/WnIuEM5L0qYzefsJx/7vvLKISr/51y[.]avi
• http[:]//vipresleynz[.]com/images/rE6bUsfRTah_2Bvt/t3ehZrbOuNAdI6_/2FpNRfRL7PGPwJs5Jp/5nMIqH1ja/5sgDepHdr2Oa tdrcS2LX/Ga_2F0e_2Fux5Vhw64n/jAy8OdZdUfisGzsuvTP7sB/HrxCSUcNWapiV/xyEilPQv/8YpUli1i_2F http[:]//ww2[.]vipresleynz[.]com/?sub1=8a137de0-e84e-11e9-b443-6fc1e91426c4
• http[:]//ww3[.]vipresleynz[.]com/
• http[:]//ww4[.]vipresleynz[.]com/ https[:]//vipresleynz[.]com/
• http[:]//jecdkeay[.]com/ https[:]//jecdkeay[.]com/
• http[:]//sizfjalenk51[.]com http[:]//sizfjalenk51[.]com/
• http[:]//sizfjalenk51[.]com/favicon[.]ico
• http[:]//sizfjalenk51[.]com/images
• http[:]//sizfjalenk51[.]com/images/472HFxZ5l4tHvgRl3V/A8Zwc5iiD/z7Hpom6i0eSZfehkwwO9/idWkaXCYz4tD3jwgjQn/_2 FlBWWURQCi0OB8d8T1GQ/aKp874_2F_2FK/Eu1f0RrN/LUEZKLleIAaDsFHtf2_2Bg6
• http[:]//sizfjalenk51[.]com/images/472HFxZ5l4tHvgRl3V/A8Zwc5iiD/z7Hpom6i0eSZfehkwwO9/idWkaXCYz4tD3jwgjQn/_2 FlBWWURQCi0OB8d8T1GQ/aKp874_2F_2FK/Eu1f0RrN/LUEZKLleIAaDsFHtf2_2Bg6/wsoUB5oioM/zD5hJDe3X/0yoD9po[.]av i
• http[:]//sizfjalenk51[.]com/images/NJmri2_2BHm80N/jV9E13yKOb3kDRyPsOhqy/4L214bCB4CIiCNwx/1cyqdTDB0ZcmPy4 /oNzpFMQCpuOVutlUy0/EJfchMJQc/VYhq3hje6X8tfhHUhqZH/wDa51WD9QurdBuQwCF9/BAhSAyvC3L/CTqbg91ZP/9[.]avi
• http[:]//sizfjalenk51[.]com/images/P5V7KNJc/qteexShBbsKgBQgofOXRwwj/07pewQrrjr/FTYuugJWn44JKiPSi/z2S4kpdTZAk V/TOJlVViQlBm/MDtevqpYSYr_2B/hCIFhnQ9iRbhWRNl9lSeE/d_2FnWgqriSkqVmW/eo4D65y6_2BM2ZT/MVT2BNHJ/R[.]avi
• http[:]//sizfjalenk51[.]com/images/Z7BhGdVjU8AWlckbQ/PZZLxG5QiZow/bQk7UvwwbS1/NSAJoOjOvdHq5e/ddEPvbqluK1 XsBKn5tp2N/YLIRKRZYv1_2BG2R/BMiL3cFVu9nHGJO/zW9fIGYwRxqSRhxRBU/QnwxdJUwt/YnQwFhSnW68K/bQ6fzOq[.]avi
• http[:]//sizfjalenk51[.]com/images/_2BQlDy3SgkoRBGGJ_2B/JjRFjohMTQ3h7vKDHFC/_2Bm4xcN8TMUBoMkRlJXyp/nTUI7P WhEmox_/2BoQzywA/SuNYm0z_2Boa7VWM4xZhO3m/yNbVTY_2BW/1BR0uhTn3vP2G8C5Y/6rtEjDWbIlQ7/lKkZHhSvz/kuX Jqk6L/q[.]avi
• http[:]//sizfjalenk51[.]com/images/he2XKahi7XFvWbEFX_2F1M/KpCebmTr_2FJ4/orwwY_2F/OF2_2FoyY15SNTGJz_2Fn8O/0 lLebBIohJ/U6X5YeviGrx64y6u2/GdgzEivYR6p_/2BiGhnWXrk7/uG9Oyl22apWEAc/8RDS5ZLbXX3I53c5UHMNB/Op1FE_2F8 m/bw8[.]avi
• http[:]//sizfjalenk51[.]com/images/j02HquE_2/F7Z2C2XRbtJDZ_2FNLI7/oLjEEJPNX1Mjjgsv8tu/88Hom2vL0sINbFa50GRWF X/k_2FTCfHfqvV2/gU5Y9o3F/lqD8NZpmLI1HfkNb_2BNnPW/r3z5xwHBIY/M60wig2JpZcn58sw0/2iZy_2F9umpI/wtrr69o7Xh G/Dhwrsxcu/ytgpd7Mu/9[.]avi
• http[:]//sizfjalenk51[.]com/images/jZ8vuoYPNX3MN33d72lzE/xiq9gcYVnssjHnJ3/EsEm43RqnxUB7L4/gXNmpAlnd5_2B8El 2S/7nVphu2an/EKoCTOkUK24bLkk2GyLO/LMqImM_2BNx0i22IKSr/vNMNRW3m_2Bk8E4Ya4yhUc/GSOHXkiSOlz0n/mvU[.] avi
• http[:]//sizfjalenk51[.]com/images/lo7ZqFtAZKahzi4gSL6/W7DIyomPQ48o1ou5in0zOH/HqPl6_2B1jveG/b556JmSF/4bWa WkGw6bC102wt3s0nt5a/eglp4vYKKX/V3apC1DVEO1B3bc1u/kDwM7qOAp_2F/vIhU_2FsY_2/FBUcR_2Ff8Urg_/2FWnC1IlU_ 2Fsg/E[.]avi
• http[:]//sizfjalenk51[.]com/images/qIDJWm6lgwj8JFWS/8dWI2kqr7kKIMsR/mawnwkdCvjhkfzm55n/8Y2Ix5H_2/Ba0_2FEGE TflUpoCus4U/fLkg_2BfQn39um2goch/2_2FldabIh6zVKiJSF4Ifm/RQvG93l2arQjJ/qsGgmgnx/x_2B3xDrCa3ZVrIkYG4Qgs2/oj 0XTNsh2Mcf/N51uSJ[.]avi

Remediation

• Block the threat indicators at their respective controls.
• Do not download email attachments even if they’re received from legitimate sources, without first confirming from the sender.
• Do not enable macros for downloaded files unless they are extremely necessary.