Analysis

  • max time kernel
    131s
  • max time network
    78s
  • platform
    windows7_x64
  • resource
    win7v20210410
  • submitted
    23-07-2021 07:18

General

  • Target

    Payment Slip.exe

  • Size

    686KB

  • MD5

    a6d092527c868bca9de40fc0d6d8032f

  • SHA1

    e8389965e4d3c5eb3fcdeeb3c2e8325216e4d392

  • SHA256

    d59601df51dd905fccccac81f6750b512dccd7c7d3cf6001c3f073a58c1905c4

  • SHA512

    9e706d49d81651e02e4ce85f9ba7f80f91193c858841e067ff88856e10d5d6bbf43a97242fc54d7f793578fcd5fd2b030c86ecfc711d0b5f1f39b80e5b42e5e7

Malware Config

Extracted

Family

agenttesla

Credentials

  • Protocol:
    smtp
  • Host:
    SMTP.mail.com
  • Port:
    587
  • Username:
    rita-adfixtures@asia.com
  • Password:
    Sunriseadaoma2020

Signatures

  • AgentTesla

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

  • AgentTesla Payload 3 IoCs
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 2 IoCs
  • Obfuscated with Agile.Net obfuscator 1 IoCs

    Detects use of the Agile.Net commercial obfuscator, which is capable of entity renaming and control flow obfuscation.

  • 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 2 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.

  • Modifies system certificate store 2 TTPs 5 IoCs
  • Suspicious behavior: EnumeratesProcesses 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 24 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Payment Slip.exe
    "C:\Users\Admin\AppData\Local\Temp\Payment Slip.exe"
    1⤵
    • Loads dropped DLL
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2040
    • C:\Windows\SysWOW64\cmd.exe
      "cmd.exe" /c REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /f /v "google browser" /t REG_SZ /d "C:\Users\Admin\AppData\Roaming\google browser.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:268
      • C:\Windows\SysWOW64\reg.exe
        REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /f /v "google browser" /t REG_SZ /d "C:\Users\Admin\AppData\Roaming\google browser.exe"
        3⤵
        • Adds Run key to start application
        PID:876
    • C:\Users\Admin\AppData\Roaming\google browser.exe
      "C:\Users\Admin\AppData\Roaming\google browser.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Suspicious use of SetThreadContext
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1480
      • C:\Users\Admin\AppData\Local\Temp\InstallUtil.exe
        "C:\Users\Admin\AppData\Local\Temp\InstallUtil.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of SetWindowsHookEx
        PID:1384

Network

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Modify Registry

2
T1112

Install Root Certificate

1
T1130

Credential Access

Credentials in Files

3
T1081

Discovery

System Information Discovery

1
T1082

Collection

Data from Local System

3
T1005

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\InstallUtil.exe
    MD5

    91c9ae9c9a17a9db5e08b120e668c74c

    SHA1

    50770954c1ceb0bb6f1d5d3f2de2a0a065773723

    SHA256

    e56a7e5d3ab9675555e2897fc3faa2dd9265008a4967a7d54030ab8184d2d38f

    SHA512

    ca504af192e3318359d4742a2ef26ae1b5d040a4f9942782e02549a310158d5d5dbf919b4c748c31ee609d2046bd23ee0c22712891c86ae4a1e3a58c6e67647e

  • C:\Users\Admin\AppData\Local\Temp\InstallUtil.exe
    MD5

    91c9ae9c9a17a9db5e08b120e668c74c

    SHA1

    50770954c1ceb0bb6f1d5d3f2de2a0a065773723

    SHA256

    e56a7e5d3ab9675555e2897fc3faa2dd9265008a4967a7d54030ab8184d2d38f

    SHA512

    ca504af192e3318359d4742a2ef26ae1b5d040a4f9942782e02549a310158d5d5dbf919b4c748c31ee609d2046bd23ee0c22712891c86ae4a1e3a58c6e67647e

  • C:\Users\Admin\AppData\Roaming\google browser.exe
    MD5

    a6d092527c868bca9de40fc0d6d8032f

    SHA1

    e8389965e4d3c5eb3fcdeeb3c2e8325216e4d392

    SHA256

    d59601df51dd905fccccac81f6750b512dccd7c7d3cf6001c3f073a58c1905c4

    SHA512

    9e706d49d81651e02e4ce85f9ba7f80f91193c858841e067ff88856e10d5d6bbf43a97242fc54d7f793578fcd5fd2b030c86ecfc711d0b5f1f39b80e5b42e5e7

  • C:\Users\Admin\AppData\Roaming\google browser.exe
    MD5

    a6d092527c868bca9de40fc0d6d8032f

    SHA1

    e8389965e4d3c5eb3fcdeeb3c2e8325216e4d392

    SHA256

    d59601df51dd905fccccac81f6750b512dccd7c7d3cf6001c3f073a58c1905c4

    SHA512

    9e706d49d81651e02e4ce85f9ba7f80f91193c858841e067ff88856e10d5d6bbf43a97242fc54d7f793578fcd5fd2b030c86ecfc711d0b5f1f39b80e5b42e5e7

  • \Users\Admin\AppData\Local\Temp\InstallUtil.exe
    MD5

    91c9ae9c9a17a9db5e08b120e668c74c

    SHA1

    50770954c1ceb0bb6f1d5d3f2de2a0a065773723

    SHA256

    e56a7e5d3ab9675555e2897fc3faa2dd9265008a4967a7d54030ab8184d2d38f

    SHA512

    ca504af192e3318359d4742a2ef26ae1b5d040a4f9942782e02549a310158d5d5dbf919b4c748c31ee609d2046bd23ee0c22712891c86ae4a1e3a58c6e67647e

  • \Users\Admin\AppData\Roaming\google browser.exe
    MD5

    a6d092527c868bca9de40fc0d6d8032f

    SHA1

    e8389965e4d3c5eb3fcdeeb3c2e8325216e4d392

    SHA256

    d59601df51dd905fccccac81f6750b512dccd7c7d3cf6001c3f073a58c1905c4

    SHA512

    9e706d49d81651e02e4ce85f9ba7f80f91193c858841e067ff88856e10d5d6bbf43a97242fc54d7f793578fcd5fd2b030c86ecfc711d0b5f1f39b80e5b42e5e7

  • memory/268-65-0x0000000000000000-mapping.dmp
  • memory/876-66-0x0000000000000000-mapping.dmp
  • memory/1384-81-0x0000000000400000-0x000000000043C000-memory.dmp
    Filesize

    240KB

  • memory/1384-87-0x0000000000481000-0x0000000000482000-memory.dmp
    Filesize

    4KB

  • memory/1384-86-0x0000000000480000-0x0000000000481000-memory.dmp
    Filesize

    4KB

  • memory/1384-84-0x0000000000400000-0x000000000043C000-memory.dmp
    Filesize

    240KB

  • memory/1384-82-0x000000000043763E-mapping.dmp
  • memory/1480-73-0x00000000021F0000-0x00000000021F1000-memory.dmp
    Filesize

    4KB

  • memory/1480-78-0x0000000000750000-0x0000000000751000-memory.dmp
    Filesize

    4KB

  • memory/1480-77-0x0000000000510000-0x000000000051B000-memory.dmp
    Filesize

    44KB

  • memory/1480-76-0x00000000021F1000-0x00000000021F2000-memory.dmp
    Filesize

    4KB

  • memory/1480-68-0x0000000000000000-mapping.dmp
  • memory/1480-71-0x0000000000A80000-0x0000000000A81000-memory.dmp
    Filesize

    4KB

  • memory/2040-64-0x0000000004B41000-0x0000000004B42000-memory.dmp
    Filesize

    4KB

  • memory/2040-63-0x0000000000660000-0x0000000000681000-memory.dmp
    Filesize

    132KB

  • memory/2040-61-0x0000000004B40000-0x0000000004B41000-memory.dmp
    Filesize

    4KB

  • memory/2040-59-0x0000000000360000-0x0000000000361000-memory.dmp
    Filesize

    4KB