Analysis

  • max time kernel
    123s
  • max time network
    134s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    26-11-2020 10:47

General

  • Target

    SecuriteInfo.com.Variant.Bulz.233365.3916.19181.exe

  • Size

    633KB

  • MD5

    47f90575c21bffd769880ab07803d12d

  • SHA1

    7711458983aef786e8807f8252b78b49fae27032

  • SHA256

    ec6609022ecc725ca1b77d8e968d79cda6beedc90c3480c7fc0ca8682a40269c

  • SHA512

    95c70e7bf7718d1fea37776c4281118b639e512a0255779a734c953f67f7ae32e1b3925d85d628b92c839781010ef89bf243575d9d4ef6892cbb85627eb516b6

Malware Config

Extracted

Family

agenttesla

C2

http://baharanvilla.ir/wp-includes/z/inc/d51b6e0eedd7ee.php

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
  • Reads data files stored by FTP clients 2 TTPs

    Tries to access configuration files associated with programs like FileZilla.

  • 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.

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Looks up external IP address via web service 2 IoCs

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

  • Suspicious use of SetThreadContext 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Variant.Bulz.233365.3916.19181.exe
    "C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Variant.Bulz.233365.3916.19181.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:292
    • C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Variant.Bulz.233365.3916.19181.exe
      "C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Variant.Bulz.233365.3916.19181.exe"
      2⤵
      • Drops file in Drivers directory
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      PID:1804

Network

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Modify Registry

1
T1112

Credential Access

Credentials in Files

3
T1081

Collection

Data from Local System

3
T1005

Replay Monitor

Loading Replay Monitor...

Downloads

  • memory/292-0-0x00000000748D0000-0x0000000074FBE000-memory.dmp
    Filesize

    6.9MB

  • memory/292-1-0x0000000000F00000-0x0000000000F01000-memory.dmp
    Filesize

    4KB

  • memory/292-3-0x0000000004540000-0x0000000004594000-memory.dmp
    Filesize

    336KB

  • memory/292-1094-0x0000000022B60000-0x0000000022B76000-memory.dmp
    Filesize

    88KB

  • memory/1804-1096-0x00000000004376FE-mapping.dmp
  • memory/1804-1095-0x0000000000400000-0x000000000043C000-memory.dmp
    Filesize

    240KB

  • memory/1804-1098-0x0000000000400000-0x000000000043C000-memory.dmp
    Filesize

    240KB

  • memory/1804-1097-0x0000000000400000-0x000000000043C000-memory.dmp
    Filesize

    240KB

  • memory/1804-1099-0x00000000748D0000-0x0000000074FBE000-memory.dmp
    Filesize

    6.9MB