Analysis

  • max time kernel
    30s
  • max time network
    130s
  • platform
    windows7_x64
  • resource
    win7-20231129-en
  • resource tags

    arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
  • submitted
    10-12-2023 16:34

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
  • 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 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:2424
  • 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:2300
    • C:\Users\Admin\AppData\Roaming\informe.exe
      C:\Users\Admin\AppData\Roaming\informe.exe
      2⤵
      • Executes dropped EXE
      PID:2588

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

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

    Filesize

    70KB

    MD5

    9f2b7aa764d02ad7e84e89e608ca08c1

    SHA1

    381366382bf970df01ce7afb9e5bee6ae160f6f9

    SHA256

    c53b6920af420ada7f38f793717a958b74dcb52e2e5307bb96e8aa6d142f5451

    SHA512

    a99f2956c343a2d4e05afc0be989ad413614bf3baab1db4a02941948d000f43a6e5e5678fa181df3d51565edf147e2fcb498a244eda7b3bde2b4e8fcf27286c3

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

    Filesize

    151KB

    MD5

    603ec47d892b5c3570d1b48a3643ab5f

    SHA1

    066612181508af2047ffb0a7c9169cfc457d8127

    SHA256

    8f1a51e46b6a0d094d990070efaea30569e7e96efee3ffde5cc78106430c85b8

    SHA512

    b08569e790b780e112460c559693bde25df4f2044c4fc6a9603420455e53b7ccae7a93e4ffaccaaca496ff942c8469d851c72a9d393652181069b77c4061e7d4

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

    Filesize

    144KB

    MD5

    83a697415b8ca36770473066918d8361

    SHA1

    8202223855bffbbd1239a93dba564543a53824cc

    SHA256

    baffb6c7854e1a7f1ffdc793ca527b3d4a135fa01624a2d64aa031c420f83e51

    SHA512

    631d65a2b017db2d2763702d0cb97b73d9911358fd4333ebdbe65a498411681cc7e9395373e4bc52fa60f0e713eecd7a09eec9a3e0c941d171c960bcbf6be95e

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

    Filesize

    131KB

    MD5

    30206e9cc1fab2784977a255c25ba4dc

    SHA1

    4d125583d1264dbeb4488d87b14786c22e8cb280

    SHA256

    458702350d4f3dc10557a18aba4eccb690bf172b0ecdbc0788b66d8f1e1e4cd1

    SHA512

    e5d72fda479c5f11dff724897ccc4313a9c4b7ef5b5c763583e05a3952ddaaaa47373fe053116e29f2fa6cde69f8759bc2a465a8ebc15c93971353aeabeb43d0

  • memory/2424-15-0x00000000724ED000-0x00000000724F8000-memory.dmp

    Filesize

    44KB

  • memory/2424-23-0x00000000724ED000-0x00000000724F8000-memory.dmp

    Filesize

    44KB

  • memory/2424-22-0x000000005FFF0000-0x0000000060000000-memory.dmp

    Filesize

    64KB

  • memory/2424-1-0x00000000724ED000-0x00000000724F8000-memory.dmp

    Filesize

    44KB

  • memory/2424-0-0x000000005FFF0000-0x0000000060000000-memory.dmp

    Filesize

    64KB

  • memory/2588-11-0x00000000002B0000-0x0000000000396000-memory.dmp

    Filesize

    920KB

  • memory/2588-12-0x000000006C500000-0x000000006CBEE000-memory.dmp

    Filesize

    6.9MB

  • memory/2588-16-0x00000000006E0000-0x00000000006E8000-memory.dmp

    Filesize

    32KB

  • memory/2588-19-0x000000006C500000-0x000000006CBEE000-memory.dmp

    Filesize

    6.9MB

  • memory/2588-18-0x00000000052B0000-0x000000000532E000-memory.dmp

    Filesize

    504KB

  • memory/2588-17-0x0000000000730000-0x000000000073A000-memory.dmp

    Filesize

    40KB

  • memory/2588-20-0x0000000000620000-0x0000000000662000-memory.dmp

    Filesize

    264KB

  • memory/2588-14-0x00000000006C0000-0x00000000006DA000-memory.dmp

    Filesize

    104KB

  • memory/2588-13-0x00000000004A0000-0x00000000004E0000-memory.dmp

    Filesize

    256KB