General

  • Target

    memz_trojan_download_(destructive)

  • Size

    183KB

  • Sample

    230417-r5vcdaef57

  • MD5

    ab62294399f29597e150176f0991245d

  • SHA1

    342c2ff65c1b3361fe7276e033ab05bb6a22ce65

  • SHA256

    e3f703b6940042d6fdca2770167b6497e9e574e8960f2f8a6b8b428752b7958a

  • SHA512

    a1c4c3267bc77b01ffabcaeeff8eeb6214d6d8e354993c3bb439ed86332870eb1f691a28376c856b89e15bcea76ebb47c35c4e0f7a790767dd444f7dc9ecb447

  • SSDEEP

    3072:Wv+5ZPCJN0CDgs8jVcNBYL9HA5KIXLzCv4F36BUysH9S:Wv+5ZPCJNWs8jVcNBYoKIH7F36BUysHc

Malware Config

Targets

    • Target

      memz_trojan_download_(destructive)

    • Size

      183KB

    • MD5

      ab62294399f29597e150176f0991245d

    • SHA1

      342c2ff65c1b3361fe7276e033ab05bb6a22ce65

    • SHA256

      e3f703b6940042d6fdca2770167b6497e9e574e8960f2f8a6b8b428752b7958a

    • SHA512

      a1c4c3267bc77b01ffabcaeeff8eeb6214d6d8e354993c3bb439ed86332870eb1f691a28376c856b89e15bcea76ebb47c35c4e0f7a790767dd444f7dc9ecb447

    • SSDEEP

      3072:Wv+5ZPCJN0CDgs8jVcNBYL9HA5KIXLzCv4F36BUysH9S:Wv+5ZPCJNWs8jVcNBYoKIH7F36BUysHc

    • BazarBackdoor

      Stealthy backdoor targeting corporate networks, believed to be developed by Trickbot's authors.

    • Bazar/Team9 Backdoor payload

    • Creates new service(s)

    • Downloads MZ/PE file

    • Drops file in Drivers directory

    • Modifies RDP port number used by Windows

    • Sets service image path in registry

    • Checks BIOS information in registry

      BIOS information is often read in order to detect sandboxing environments.

    • Checks computer location settings

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

    • Executes dropped EXE

    • Loads dropped DLL

    • Modifies file permissions

    • Reads user/profile data of web browsers

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

    • Registers COM server for autorun

    • Windows security modification

    • Adds Run key to start application

    • 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.

    • Drops Chrome extension

    • 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

    • 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.

    • Drops file in System32 directory

MITRE ATT&CK Enterprise v6

Tasks