General

  • Target
    index.html
  • Size 2KB
  • Sample260808-vmrejsee64
  • SHA256 e2a146a9e16946ac2d1a0e888065c16ea9d22e3747bac5e59be81a5f9e482c08
  • MD5 SHA1 SHA512 TLSH

Malware Config

Extracted

Family
  • crimsonrat

C2
  • 185.136.161.124

Targets

    • Target
      index.html
    • Size 2KB
    • SHA256 e2a146a9e16946ac2d1a0e888065c16ea9d22e3747bac5e59be81a5f9e482c08
    • MD5 SHA1 SHA512 TLSH
    • Chimera Ransomware Loader DLL

      Drops/unpacks executable file which resembles Chimera's Loader.dll.

    • CrimsonRAT main payload

    • Family: Chimera

      Ransomware which infects local and network files, often distributed via Dropbox links.

    • Family: CrimsonRat

      Crimson RAT is a malware linked to a Pakistani-linked threat actor.

    • Family: Floxif, Floodfix

      Floxif aka FloodFix is a file-changing trojan and backdoor written in C++.

    • Family: Troldesh, Shade, Encoder.858

      Troldesh is a ransomware spread by malspam.

    • Modifies visibility of file extensions in Explorer

    • Detects Floxif payload

    • Renames multiple (3463) files with added filename extension

      This suggests ransomware activity of encrypting all the files on the system.

    • Drops file in Drivers directory

    • ACProtect 1.3x - 1.4x DLL software

      Detects file using ACProtect software.

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Executes dropped EXE

    • Loads dropped DLL

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

    • Adds Run key to start application

    • Checks installed software on the system

      Looks up Uninstall key entries in the registry to enumerate software on the system.

    • Contacts third-party web service commonly abused for C2

      Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.

    • Drops desktop.ini file(s)

    • Looks up external IP address via web service

      Uses a legitimate IP lookup service to find the infected system's external IP.

    • Writes to the Master Boot Record (MBR)

      Bootkits write to the MBR to gain persistence at a level below the operating system.

    • Executes a VBScript file via the Windows Script Host.

    • UPX packed file

      Detects executables packed with UPX/modified UPX open source packer.

MITRE ATT&CK Enterprise v16

Tasks