Overview

overview

10

Static

static

10

76BVN20070...DF.exe

windows7_x64

10

76BVN20070...DF.exe

windows10-2004_x64

10

Analysis

  • max time kernel
    148s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    21-05-2022 12:27

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General

  • Target

    76BVN200706awbinformation_PDF.exe

  • Size

    5.1MB

  • MD5

    1082b9039a4b9fafd5d6c40663bed8a2

  • SHA1

    7f9a433442b492d6860dcab52b4aa83bfb495222

  • SHA256

    ec4f62108a0efc101539e57198ffffaac7be084e792b43daeb4561881c0fc2f2

  • SHA512

    dfdade40ac974165dbff9e0d40be375416a7116f13e6769d366452d352562dcee65a1c7c0bf894e405d9e83a355fdcb7171b0525aaac6c4733d3eb4695efbc41

Score
10/10
asyncratgrace overflowpersistencerat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

GRACE OVERFLOW

Mutex

AsyncMutex_6SI8OkPnk

Attributes
  • delay

    3

  • install

    false

  • install_folder

    %AppData%

  • pastebin_config

    https://pastebin.com/raw/Q3bqVVf9

aes.plain

Signatures

  • AsyncRat

    AsyncRAT is designed to remotely monitor and control other computers.

    ratasyncrat
  • Async RAT payload 4 IoCs
    rat
  • Executes dropped EXE 2 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Adds Run key to start application 2 TTPs 2 IoCs
    persistence
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Suspicious behavior: EnumeratesProcesses 27 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 17 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\76BVN200706awbinformation_PDF.exe
    "C:\Users\Admin\AppData\Local\Temp\76BVN200706awbinformation_PDF.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1916
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c REG ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /f /v gvbuild /t REG_SZ /d C:\Windows\system32\pcalua.exe" -a C:\Users\Admin\AppData\Roaming\vgbuild.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3832
      • C:\Windows\SysWOW64\reg.exe
        REG ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /f /v gvbuild /t REG_SZ /d C:\Windows\system32\pcalua.exe" -a C:\Users\Admin\AppData\Roaming\vgbuild.exe"
        3⤵
        • Adds Run key to start application
        PID:2800
    • C:\Users\Admin\AppData\Roaming\vgbuild.exe
      "C:\Users\Admin\AppData\Roaming\vgbuild.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetThreadContext
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:3476
      • C:\Users\Admin\AppData\Local\Temp\AddInProcess32.exe
        "C:\Users\Admin\AppData\Local\Temp\AddInProcess32.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:2600

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1
T1060

Privilege Escalation

Defense Evasion

Modify Registry

1
T1112

Credential Access

Discovery

Query Registry

1
T1012

System Information Discovery

2
T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Web Service

1
T1102

Impact

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\AddInProcess32.exe
    Filesize

    42KB

    MD5

    9827ff3cdf4b83f9c86354606736ca9c

    SHA1

    e73d73f42bb2a310f03eb1bcbb22be2b8eb7c723

    SHA256

    c1cf3dc8fa1c7fc00f88e07ad539979b3706ca8d69223cffd1d58bc8f521f63a

    SHA512

    8261828d55f3b5134c0aeb98311c04e20c5395d4347251746f3be0fb854f36cc7e118713cd00c9867537e6e47d5e71f2b2384fc00c67f0ae1b285b8310321579

    Download Submit
  • C:\Users\Admin\AppData\Local\Temp\AddInProcess32.exe
    Filesize

    42KB

    MD5

    9827ff3cdf4b83f9c86354606736ca9c

    SHA1

    e73d73f42bb2a310f03eb1bcbb22be2b8eb7c723

    SHA256

    c1cf3dc8fa1c7fc00f88e07ad539979b3706ca8d69223cffd1d58bc8f521f63a

    SHA512

    8261828d55f3b5134c0aeb98311c04e20c5395d4347251746f3be0fb854f36cc7e118713cd00c9867537e6e47d5e71f2b2384fc00c67f0ae1b285b8310321579

    Download Submit
  • C:\Users\Admin\AppData\Roaming\vgbuild.exe
    Filesize

    5.1MB

    MD5

    1082b9039a4b9fafd5d6c40663bed8a2

    SHA1

    7f9a433442b492d6860dcab52b4aa83bfb495222

    SHA256

    ec4f62108a0efc101539e57198ffffaac7be084e792b43daeb4561881c0fc2f2

    SHA512

    dfdade40ac974165dbff9e0d40be375416a7116f13e6769d366452d352562dcee65a1c7c0bf894e405d9e83a355fdcb7171b0525aaac6c4733d3eb4695efbc41

    Download Submit
  • C:\Users\Admin\AppData\Roaming\vgbuild.exe
    Filesize

    5.1MB

    MD5

    1082b9039a4b9fafd5d6c40663bed8a2

    SHA1

    7f9a433442b492d6860dcab52b4aa83bfb495222

    SHA256

    ec4f62108a0efc101539e57198ffffaac7be084e792b43daeb4561881c0fc2f2

    SHA512

    dfdade40ac974165dbff9e0d40be375416a7116f13e6769d366452d352562dcee65a1c7c0bf894e405d9e83a355fdcb7171b0525aaac6c4733d3eb4695efbc41

    Download Submit
  • memory/1916-130-0x0000000000DB0000-0x00000000012D2000-memory.dmp
    Filesize

    5.1MB

    Download
  • memory/1916-131-0x0000000006240000-0x00000000067E4000-memory.dmp
    Filesize

    5.6MB

    Download
  • memory/1916-132-0x0000000005D90000-0x0000000005E22000-memory.dmp
    Filesize

    584KB

    Download
  • memory/2600-138-0x0000000000000000-mapping.dmp
    Download
  • memory/2600-139-0x0000000000400000-0x0000000000412000-memory.dmp
    Filesize

    72KB

    Download
  • memory/2800-134-0x0000000000000000-mapping.dmp
    Download
  • memory/3476-135-0x0000000000000000-mapping.dmp
    Download
  • memory/3832-133-0x0000000000000000-mapping.dmp
    Download