crimsonrat

General

Target

.
Size

147KB
Sample

240514-r7pjxabe3t
MD5

ae16c0e6b3a18a28bf0a0974f1622568
SHA1

106a2deebd06e2931be677b09d4f818d68c76d74
SHA256

b941e34ee71c1eb4c2bb473adc99c62643c9be13bb6c67b0aa3308d61cbdbddd
SHA512

407ac0936b5e5890c6e4f213e410cdb3fda8efec318128de1b3068b7626cd144ba27ee2ce7c381a6013760bd5964ee4c9e321251d50e6c3b94c7b24d80d63867
SSDEEP

1536:olkud8TPV9vK4DNvGR4Dbll1qKf+30vD932Os4DjHhqiS:2kPT3V+CllQHKNHhqiS

Score

10^/10

Malware Config

Extracted

Family

crimsonrat

C2

185.136.161.124

Targets

- Target
  
  .
- Size
  
  147KB
- MD5
  
  ae16c0e6b3a18a28bf0a0974f1622568
- SHA1
  
  106a2deebd06e2931be677b09d4f818d68c76d74
- SHA256
  
  b941e34ee71c1eb4c2bb473adc99c62643c9be13bb6c67b0aa3308d61cbdbddd
- SHA512
  
  407ac0936b5e5890c6e4f213e410cdb3fda8efec318128de1b3068b7626cd144ba27ee2ce7c381a6013760bd5964ee4c9e321251d50e6c3b94c7b24d80d63867
- SSDEEP
  
  1536:olkud8TPV9vK4DNvGR4Dbll1qKf+30vD932Os4DjHhqiS:2kPT3V+CllQHKNHhqiS
Score

10^/10

crimsonrat darkcomet njrat bootkit discovery evasion macro macro_on_action persistence ransomware rat spyware stealer trojan
- CrimsonRAT main payload
- CrimsonRat
  Crimson RAT is a malware linked to a Pakistani-linked threat actor.
  rat crimsonrat
- Darkcomet
  DarkComet is a remote access trojan (RAT) developed by Jean-Pierre Lesueur.
  trojan rat darkcomet
- Modifies WinLogon for persistence
  persistence
- njRAT/Bladabindi
  Widely used RAT written in .NET.
  trojan njrat
- Modifies boot configuration data using bcdedit
  ransomware evasion
- Downloads MZ/PE file
- Drops file in Drivers directory
- Modifies Installed Components in the registry
  persistence
- Modifies Windows Firewall
  evasion
- Office macro that triggers on suspicious action
  Office document macro which triggers in special circumstances - often malicious.
  macro macro_on_action
- Sets file to hidden
  Modifies file attributes to stop it showing in Explorer etc.
  evasion
- Sets service image path in registry
  persistence
- Checks computer location settings
  Looks up country code configured in the registry, likely geofence.
- Drops startup file
- Executes dropped EXE
- Loads dropped DLL
- Modifies system executable filetype association
  persistence
- Reads user/profile data of web browsers
  Infostealers often target stored browser data, which can include saved credentials etc.
  spyware stealer
- Registers COM server for autorun
  persistence
- Unexpected DNS network traffic destination
  Network traffic to other servers than the configured DNS servers was detected on the DNS port.
- Adds Run key to start application
  persistence
- Checks for any installed AV software in registry
- Checks installed software on the system
  Looks up Uninstall key entries in the registry to enumerate software on the system.
  discovery
- Checks whether UAC is enabled
  evasion trojan
- Drops desktop.ini file(s)
- Enumerates connected drives
  Attempts to read the root path of hard drives other than the default C: drive.
- Legitimate hosting services abused for malware hosting/C2
- Writes to the Master Boot Record (MBR)
  Bootkits write to the MBR to gain persistence at a level below the operating system.
  bootkit persistence
- Drops file in System32 directory
behavioral1