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September 22, 2023
Severity High Analysis Summary Ducktail Malware is a malicious program designed by hackers to infiltrate computers and networks globally. Ducktail malware is typically delivered through a […]September 22, 2023Severity Medium Analysis Summary First discovered in 2016, Revenge RAT is a remote access trojan (RAT) designed to give an attacker complete control over an infected […]September 22, 2023Severity High Analysis Summary The Konni APT (Advanced Persistent Threat) group is a cyber espionage group that has been active since at least 2014. It is […]Threat Insights
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Platform
Managed Security Services
Managed Penetration Testing
Rewterz penetration testing services help organizations determine if a cyber attacker can gain access to their critical assets while giving them detailed insights of the overall business impact of a cyber attack.
Resources
September 22, 2023Severity High Analysis Summary Ducktail Malware is a malicious program designed by hackers to infiltrate computers and networks globally. Ducktail malware is typically delivered through a […]September 22, 2023Severity Medium Analysis Summary First discovered in 2016, Revenge RAT is a remote access trojan (RAT) designed to give an attacker complete control over an infected […]September 22, 2023Severity High Analysis Summary The Konni APT (Advanced Persistent Threat) group is a cyber espionage group that has been active since at least 2014. It is […]Threat Insights
Before Rewterz got its start, the market was in dire need of a specialized and dedicated information security company. It was nearly impossible for businesses to find a trustworthy provider that could truly cover all of their bases. We wanted to meet this need, giving companies across the globe a chance to get ahead while knowing that their data is in good hands.
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Rewterz Threat Advisory – Cisco Intelligent Proximity SSL Certificate Validation Vulnerability
March 5, 2020Rewterz Threat Alert – Lazarus FastCash Activity – IOC’s
March 7, 2020
Severity
High
Analysis Summary
A recent campaign is pushing 2 RATs, encrypted, packed, and hidden in PNG files – using disk image files again and redirectors as arrival vectors.
The first spam campaign is about fake harassment. The sender, claiming to be a school president, is informing his colleague that an anonymous email with video, supposedly in the attachment, shows sexual harassment occurred on their premises.
The attachment CONFIDENTIAL0056.zip is a ZIP archive. Inside it is a disk image file CONFIDENTIAL0056.iso which is the Universal Disk Format (UDF) file system format. The image file CONFIDENTIAL0056.iso contains a RAR self-extracting archive (RARSfx) file PRIORITY.scr. Once launched, the RARSfx will silently drop and install 3 files in the %temp% folder. First, a shortcut file Xnekm.lnk will be created. It points to and therefore runs an executable Zhknjdc.exe which is in a folder with the same name as the LNK file. Stored with the EXE file is an image file Zhkn.png.
A related spam campaign was spotted using fake purchase emails. The attachment PO-1109017834665.xlsx.html, disguised as an order slip, is an HTML redirector. It contains a META refresh tag that leads to the download of a RAR file. The HTML also has a hidden paragraph tag with random word padding causing the huge file size of the attachment.
The downloaded file PO-1109017834665.xlsx.rar is a RAR archive which contains 1 file PO-1109017834665.xlsx.exe – a Delphi compiled executable. The EXE’s behavior is almost the same with the EXE file dropped by RARSfx from the first campaign, except the associated PNG is located at its overlay, in other words appended to the end of the executable.
Impact
- Unauthorized Remote Access
- Code Execution
- Theft of information
Indicators of Compromise
Domain Name
- rneiko-elec[.]com
- checker[.]rneiko-elec[.]com
Filename
- CONFIDENTIAL0056[.]iso
- PRIORITY[.]scr[.]rar
- Xnekm[.]lnk
- Zhknjdc[.]exe
- Zhkn[.]png
- Zhknasx[.]exe
- Zhkn_eno[.]hta
- Zhknwen[.]vbs
- perfmon[.]exe
- SSPICLI[.]dll
- Clean[.]bat
- Runex[.]bat
- PO-1109017834665[.]xlsx[.]html
- PO-1109017834665[.]xlsx[.]rar
- PO-1109017834665[.]xlsx[.]exe
MD5
- 3ac401065eb9d48059c49dcdf33d2ca5
- 59e3864ca11e225e3aaa45563e79366a
- d1b75a294c1a2587597f72219d83eadb
- 1dc7995611e26f0e9115a6cd24f0fd1a
- 53498948bc156c8668d68069a73b3dd0
- 03553ce35dfbcabb3ab0b97bd736dbc2
- 0ebe2999e11aef84f3ffd5214f229947
- cef35f9517245d69437ef388ba63ab0f
- 0d897eb9c40f5f595119e5ecb26df68e
SHA-256
- 1e922165e003afe690f81475c957c3812e0f259ea096d227c6d83a8e74b9a83b
- 27b1d8628d1c3d7757c86044b9108a1531d92409f012c45c015eda488df11962
- 2dc4b6bb83457434e26df3164a9099e4177dd98c967d1ea76f3a3d1a2de8d0c6
- 38645d831c28a61afe81fd8c1a786a87ec10ca5059aac03c1f588dace99b5701
- 51dde941670399254ca3480ba22e8ea2aab6854f1ea52e519b28dc2e8d1c66ec
- 83ab486dcd157c14d78e8ba26a8ef4ced34eab344fff1d88558907474dff2d6a
- a26c8cb3853fb5aaeb9a55bacd6eb452a42b0643b6fa8a9a2fc699b41ae51330
- ab60d9d83563c90a10ddec762c39790300afcd4455d029eb6fa5e5c999478870
- b00aedd64879c414c0cb28b3157be35c4a2ef66e5e93f47cbd65cab5810e4e6b
- ead64a6e6cddf7f33f5f7f6b03236e395c2a6d2f94af85112b94c426b247354c
- 119704c353d172f06cf512500e42c94e7c8df9635d462ea0e92b45366f444466
- 0fc72c2cb306f98c12477023d3f7ac2e77948707cb1920b93c98949c2d5a38f9
- 09a5bd9a06840dfb8560ff097505d86d77af1f08877601893262bf14c58c43c5
- 64c812b78b0085eb9d04b66e5872bdbacdc230b0c29a0bd13b71190f3e610dd0
SHA1
- c3b54681e8ac61e605bd399ac680ac15b5608033
- 9742aebce253bfcf3819e28fd5e6ca1e58c10bbf
- 92c8d3dc444e9e6c3b1a7cf94dbee02e4c7bda00
- a224db9e9f2f347587dc398cb898057ce50326f5
- aada5c5af3232a16f7906307326673c5749e3bbb
URL
- http[:]//checker[.]rneiko-elec[.]com
- http[:]//checker[.]rneiko-elec[.]com/
- http[:]//checker[.]rneiko-elec[.]com[:]11012/
- http[:]//checker[.]rneiko-elec[.]com[:]11012
Remediation
- Block the threat indicators at their respective controls.
- Do not respond to unexpected emails.
- Do not download unexpected email attachments and do not click on URLs attached in untrusted emails.