Rewterz Threat Alert – Active C2 Detected Hosting Ransomware, POS Malware and Others

November 5, 2019

Severity

High

Analysis Summary

An active threat actor is found targeting and compromising different companies. The attacker operates a new server hosting a large stockpile of malicious files. The adversary can deploy ransomware as well as steal credit card information via a point-of-sale malware and remotely managed compromised infrastructure. These files shows that these attackers were able to obtain a deep level of access to victims’ infrastructure using ransomware like the DopplePaymer, credit card capture malware like the TinyPOS, as well as some loaders that execute code delivered directly from the command and control (C2).

The adversary is resourceful and has a widespread infrastructure. A WinRAR self-extracting archive (SFX) is used to extract the ransomware and execute the following command:
Path=C:\Users–redacted–\DesktopSetup=C:\Users–redacted–\Desktop\p1q135no.exe QWD5MRg95gUEfGVSvUGBY84h

On the same server a TinyPOS sample was also found. This malware is installed using a batch file.The batch file creates a scheduled task that will be executed every 6 hours.
The data going out is obfuscated using XOR operations with a hardcoded key of 0xcaef3d8a. The malware exfiltrates the hostname and the local IP of the infected system. It searches and parses targeted processes memory to retrieve credit card information, which is usually stored in tracks 1 and 2 of the magnetic strip of the credit card.
Other malicious tools hosted on the server include Mimikatz, a tool to retrieve Windows credentials from the memory, PsExec: A tool to remotely connect on Windows system (The attacker probably used it to pivot inside the infrastructure by using the credential previously retrieved.), Procdump: A tool to dump process. The attacker probably used it to dump the LSASS.exe process to then use with Mimikatz. The attacker likely was planning to carry out fake tech support scam to attempt to compromise infrastructure. This would likely be carried out by asking employees to execute specific commands or attempting to download the malware provided by the attacker.

Impact

Files Encryption
Theft of Credit Card Information
Credential Theft
Code Execution

Indicators of Compromise

Domain Name

Jduuyerm[.]website
techsupport[.]org[.]ru
www.techsupport[.]org[.]ru
techsupportlap[.]icu
techsupportnet[.]icu
aefawexxr54xrtrt[.]softether[.]net

MD5

8663a9dfa3b5c5b623d4364f320c64ef
81c30c38e33abf112b54697e8751954a
69061465ae5067710402c832412e2dae
8c54bbe3f191a8627bfeeb4cb02634a9
38e6484610d84de6a488c5d048e84e8c
f6cb9538add106196db23b162ba82125
8663a9dfa3b5c5b623d4364f320c64ef
444581f3d716abeb88d9367392a0a9aa
967d62e4204430fc0d36887a46f5a781
eb23f879a78736a27b5ce13a4bddaee2

SH256
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SHA1

7cab077546328948ea4f801b175079bfbc6f63bd
fceb70eafee76d2161e11248ce9849dee366e5b9
963f6c4e2f7c202fd1676eee27c160de2ad2f774
2fc2ecbed153344557386e80a2fbd097bf795559
8afd15b8273df0ebc10e6a8b78ce062f86cbf32e
4478f32dcce2de8f1959fb6cf50a9d4cc6c0ae06
7cab077546328948ea4f801b175079bfbc6f63bd
d6704c8cf07fcfa1c35f9c65939d92a1301845f7
08558ce4fc178d3858c8579fcadfea0e131d7d8b
483ac8d56bb882162b871558e589655c7326a396

Source IP

185.254.188[.]11
185.212.128[.]189

Remediation

Block the threat indicators at their respective controls.
Do not acquire tech support services from unknown service providers.
Do not download files attached in untrusted emails.