Analysis

  • max time kernel
    150s
  • max time network
    126s
  • platform
    windows7_x64
  • resource
    win7-20231025-en
  • resource tags

    arch:x64arch:x86image:win7-20231025-enlocale:en-usos:windows7-x64system
  • submitted
    10-12-2023 16:32

General

  • Target

    comprobante.xlam

  • Size

    677KB

  • MD5

    e80d7b0d84d9813bbc036baf7070b8e2

  • SHA1

    19d8a69fb20ecc14e6b2fc3a48d5781b9a5deece

  • SHA256

    c257a8f4249d22d5f0250b80d0822fa437183f70123d2a7175330f8a34a278cb

  • SHA512

    6c905815e8fe63fe1e926238ec456b842e423cc4817098ef374f1c98645bfbea10c90e5af29d8ee9673bd9357a81dbcfce806579c7c644524eb420713155c858

  • SSDEEP

    12288:LWcIIO6L8S0N5nukjjdIf0166RHf8xvhj+LvweiUeXPlgCwVgXNJi8zlj2fW:LWqLehjjygf8thYvkU6PB

Malware Config

Extracted

Family

agenttesla

Credentials

  • Protocol:
    ftp
  • Host:
    ftp://ftp.siscop.com.co
  • Port:
    21
  • Username:
    [email protected]
  • Password:
    +5s48Ia2&-(t

Signatures

  • AgentTesla

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

  • Blocklisted process makes network request 1 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 1 IoCs
  • Reads user/profile data of local email clients 2 TTPs

    Email clients store some user data on disk where infostealers will often target it.

  • Reads user/profile data of web browsers 2 TTPs

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

  • Looks up external IP address via web service 1 IoCs

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

  • Enumerates system info in registry 2 TTPs 1 IoCs
  • Launches Equation Editor 1 TTPs 1 IoCs

    Equation Editor is an old Office component often targeted by exploits such as CVE-2017-11882.

  • Modifies Internet Explorer settings 1 TTPs 31 IoCs
  • Modifies registry class 64 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of SetWindowsHookEx 3 IoCs
  • Suspicious use of WriteProcessMemory 4 IoCs

Processes

  • C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE
    "C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde C:\Users\Admin\AppData\Local\Temp\comprobante.xlam
    1⤵
    • Enumerates system info in registry
    • Modifies Internet Explorer settings
    • Modifies registry class
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious use of SetWindowsHookEx
    PID:1968
  • C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE
    "C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE" -Embedding
    1⤵
    • Blocklisted process makes network request
    • Loads dropped DLL
    • Launches Equation Editor
    • Suspicious use of WriteProcessMemory
    PID:2636
    • C:\Users\Admin\AppData\Roaming\informe.exe
      C:\Users\Admin\AppData\Roaming\informe.exe
      2⤵
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2544

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • \Users\Admin\AppData\Roaming\informe.exe

    Filesize

    898KB

    MD5

    7d0f12a4f6f4b516672c222b75d3b4a4

    SHA1

    24d49f1738f848d1b04d75e9e5779c6e51209fb1

    SHA256

    123159059996fe70e697717341356dc29963680e2733f7549e964a6679a88fbb

    SHA512

    ba2059445113dc4a64fb8dfab8a7c35f82ad2a27e99cc2f53991fc84dfc15561aa736e6cd0468088693d90e9431f7bfd37bdc44e8ad2012bfd8609e3505b33e0

  • memory/1968-15-0x00000000727ED000-0x00000000727F8000-memory.dmp

    Filesize

    44KB

  • memory/1968-1-0x00000000727ED000-0x00000000727F8000-memory.dmp

    Filesize

    44KB

  • memory/1968-24-0x00000000727ED000-0x00000000727F8000-memory.dmp

    Filesize

    44KB

  • memory/1968-23-0x000000005FFF0000-0x0000000060000000-memory.dmp

    Filesize

    64KB

  • memory/1968-0-0x000000005FFF0000-0x0000000060000000-memory.dmp

    Filesize

    64KB

  • memory/2544-16-0x0000000000440000-0x0000000000448000-memory.dmp

    Filesize

    32KB

  • memory/2544-14-0x0000000000490000-0x00000000004AA000-memory.dmp

    Filesize

    104KB

  • memory/2544-13-0x0000000000810000-0x0000000000850000-memory.dmp

    Filesize

    256KB

  • memory/2544-17-0x00000000004F0000-0x00000000004FA000-memory.dmp

    Filesize

    40KB

  • memory/2544-18-0x0000000005490000-0x000000000550E000-memory.dmp

    Filesize

    504KB

  • memory/2544-19-0x000000006C5B0000-0x000000006CC9E000-memory.dmp

    Filesize

    6.9MB

  • memory/2544-20-0x0000000000810000-0x0000000000850000-memory.dmp

    Filesize

    256KB

  • memory/2544-21-0x0000000000270000-0x00000000002B2000-memory.dmp

    Filesize

    264KB

  • memory/2544-12-0x000000006C5B0000-0x000000006CC9E000-memory.dmp

    Filesize

    6.9MB

  • memory/2544-11-0x00000000002B0000-0x0000000000396000-memory.dmp

    Filesize

    920KB