Analysis

  • max time kernel
    120s
  • max time network
    126s
  • platform
    windows10_x64
  • resource
    win10-en-20211014
  • submitted
    25-10-2021 12:40

General

  • Target

    vbc.exe

  • Size

    816KB

  • MD5

    f1119af41aa1a22ea18df0c7b51aac11

  • SHA1

    22c83312287db61ecfe83256f44b99be4ac25919

  • SHA256

    c37506485694a1440ecbf47a0084a3691084e0869abb163f353fe081e1c49670

  • SHA512

    12324f2a6fea3f0d27e62f6f4348a3aff5740a8ca886f0f3629c1d16843909f35d8444b70ed57fd739aac5ba1c60902819f9bd0dd7443603977dba71f7857b7a

Malware Config

Extracted

Family

agenttesla

Credentials

  • Protocol:
    smtp
  • Host:
    mail.enerzi.co
  • Port:
    587
  • Username:
    [email protected]
  • Password:
    Enerzis@123!#

Signatures

  • AgentTesla

    Agent Tesla is a remote access tool (RAT) written in visual basic.

  • AgentTesla Payload 2 IoCs
  • Uses the VBS compiler for execution 1 TTPs
  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 14 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\vbc.exe
    "C:\Users\Admin\AppData\Local\Temp\vbc.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2108
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\gzjBwHgX" /XML "C:\Users\Admin\AppData\Local\Temp\tmp6EA4.tmp"
      2⤵
      • Creates scheduled task(s)
      PID:3772
    • C:\Users\Admin\AppData\Local\Temp\vbc.exe
      "C:\Users\Admin\AppData\Local\Temp\vbc.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2552
      • C:\Windows\Microsoft.NET\Framework\v2.0.50727\dw20.exe
        dw20.exe -x -s 696
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1796

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Microsoft\CLR_v2.0_32\UsageLogs\vbc.exe.log

    MD5

    ef140ef600b2463c9e7dbf064a104046

    SHA1

    c08fd1853877be95575ea2e860dd8cafef31f54c

    SHA256

    ad8ae97fdeb174b20f02c7ddf9466981856d77d51133599b5954f48f78a1b616

    SHA512

    bf16df0994080bdc832cb39a312e0095de57608256fcf0d04d589e0bdf3283f918fb0d6ec86ea28a4b1af6db12813c52a724028f02330ebc3a9d32a4fcda706c

  • memory/1796-120-0x0000000000000000-mapping.dmp

  • memory/2108-115-0x00000000011D0000-0x00000000011D1000-memory.dmp

    Filesize

    4KB

  • memory/2552-117-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/2552-118-0x00000000004375DE-mapping.dmp

  • memory/2552-121-0x0000000001450000-0x0000000001451000-memory.dmp

    Filesize

    4KB

  • memory/3772-116-0x0000000000000000-mapping.dmp