Analysis

  • max time kernel
    98s
  • max time network
    53s
  • platform
    windows7_x64
  • resource
    win7
  • submitted
    12-07-2020 08:12

General

  • Target

    Original invoice.exe

  • Size

    799KB

  • MD5

    903746d6c18aef7b3acbf91fb0b1ba11

  • SHA1

    7712236e9d81cc5654023d7a21b0a518ea2b53d9

  • SHA256

    1debc399539d6dddfa7522dbf42b2ade7d0e56179588fae9f144301a84629e50

  • SHA512

    794e32b00aeda08552e8c05a94ded42b135f605d86dfe0d9d8f4cdbc0630226d1f957913d555f50efc638499aa75c8cad924cf1158bb96f9232d29fe0b4eb18a

Malware Config

Extracted

Family

agenttesla

Credentials

  • Protocol:
    smtp
  • Host:
    mail.amberresidenceng.com
  • Port:
    587
  • Username:
    reservations@amberresidenceng.com
  • Password:
    Amber_2017

Signatures

  • AgentTesla

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

  • AgentTesla Payload 4 IoCs
  • Drops file in Drivers directory 1 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • 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.

  • Modifies registry key 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 20 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Original invoice.exe
    "C:\Users\Admin\AppData\Local\Temp\Original invoice.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1496
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\hzpICGBx" /XML "C:\Users\Admin\AppData\Local\Temp\tmpD4FA.tmp"
      2⤵
      • Creates scheduled task(s)
      PID:1900
    • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
      "{path}"
      2⤵
      • Drops file in Drivers directory
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1956
      • C:\Windows\SysWOW64\REG.exe
        REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System / v DisableTaskMgr / t REG_DWORD / d 1 / f
        3⤵
        • Modifies registry key
        PID:852

Network

MITRE ATT&CK Matrix ATT&CK v6

Execution

Scheduled Task

1
T1053

Persistence

Registry Run Keys / Startup Folder

1
T1060

Scheduled Task

1
T1053

Privilege Escalation

Scheduled Task

1
T1053

Defense Evasion

Modify Registry

2
T1112

Discovery

System Information Discovery

1
T1082

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\tmpD4FA.tmp
    MD5

    737ee5aea0ac473e1c705fd00aadaae1

    SHA1

    34699d5bc905ddd85183ad3080844911f82784dd

    SHA256

    10550d4d2f5b7cc39db46346cb5dcbca2200311713371e1cfc3a8c3c4e7f7016

    SHA512

    65737db896ffd631a6d9d5c963de5e8a64ff45848b5d4a5f45ba1dd683f43887b117db7bde7c161779eaaa351706ae019ed7d9579d1dd8d348dc87c4a94e64f0

  • memory/852-8-0x0000000000000000-mapping.dmp
  • memory/1496-1-0x0000000000000000-0x0000000000000000-disk.dmp
  • memory/1900-2-0x0000000000000000-mapping.dmp
  • memory/1956-4-0x0000000000400000-0x000000000044C000-memory.dmp
    Filesize

    304KB

  • memory/1956-5-0x0000000000446F0E-mapping.dmp
  • memory/1956-6-0x0000000000400000-0x000000000044C000-memory.dmp
    Filesize

    304KB

  • memory/1956-7-0x0000000000400000-0x000000000044C000-memory.dmp
    Filesize

    304KB