Rewterz Threat Alert – Kimsuky APT Group – Active IOCs
December 23, 2021Rewterz Threat Alert – SmokeLoader Malware – Active IOCs
December 23, 2021Rewterz Threat Alert – Kimsuky APT Group – Active IOCs
December 23, 2021Rewterz Threat Alert – SmokeLoader Malware – Active IOCs
December 23, 2021Severity
High
Analysis Summary
DJVU was one of the most active and widespread versions of ransomware in 2019. DJVU was first used aggressively in campaigns in 2019, even though it had been around for about a year. Continuously changing its extensions and payloads has helped it evade detection. Its encryption techniques also continue to improve. Earlier versions of the malware, where the key was not generated by its command and control servers, were easier to recover the files. In current versions, decryption is more difficult. Delivery of the malware has been through cracked programs, keygens, activators, fake setup programs, and fake Windows updates. To avoid infecting victims in specific countries, DJVU did not use local information, such as keyboard layouts and timezone settings, but rather it uses the information returned by a request sent to https[:]//api.2ip.ua/geo.json. Persistence is achieved through a scheduled task. The MAC address of the ethernet card is used as the basis of a unique identifier for the system. This identifier is sent to DJVU’s command and control server when then returns an RSA-2048 public key to be used in the encryption. Additional malware is then downloaded and installed, including an information stealer called Vidar.
Impact
- Information Theft
- File Encryption
Indicators of Compromise
MD5
- c2d8fed47570f1e5f84365af2e544d01
- 48644bc4a8243faf7a24252b8686797f
- c6d8ed37b8bfbddbbb94d563d39aa6be
- c282ada6f2f1865b9f193604a77be50c
SHA-256
- f3a0806bf7e9030e703483f4469a2292d9595d500a2365336de454a3bf047e26
- 8f1037caacf898ac8848741d377546292dbe070aeda34079a81bba8857df3cdb
- f0edfdc1e8b3284e76732827d2569a6343718c0198660fed9565b3ec6c06024d
- ac6db0c7303aa294dc3f00fe7b332c460a167b3e23befe0e3487528fca5c833e
SHA-1
- 69cf06178f3b0ff2d8a6ce1933c3a1726b568367
- 47b5e56605dc50b2a99d1eb7642fdf77b8fd22de
- cf216b89a6ae6bd7c31edd4253c1e9007ddd7c8f
- 6acd219bfdff443b5ad9bc347b321121baa0560d
Remediation
- Block all threat indicators at your respective controls.
- Search for IOCs in your environment.
- Always be suspicious about emails sent by unknown senders.
- Never click on the links/attachments sent by unknown senders.