Analysis

  • max time kernel
    75s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    21-05-2022 19:16

General

  • Target

    scan_004768.pdf.exe

  • Size

    84KB

  • MD5

    586552ad9112f084e84c2111cad12ec2

  • SHA1

    48a50e32aefe8cc29de241c33a91e4ea6c9f7d4b

  • SHA256

    bb5e9e2aea9052040d072c9c9b161d2d5a88c50b049e5a505b016e80910256a0

  • SHA512

    93a35be4aaecae9a6e118af85ef78d4041ca54b8b18d1bfb6b7acd0827d8f05b1d3f399e9227ed1e5ff53ddaa44588d451d987a98e34f68f957d33a1049c7894

Malware Config

Extracted

Family

guloader

C2

https://drive.google.com/uc?export=download&id=1SxDM6GGV4qlGFgGvRFhzDr_ALJPLe5wr

xor.base64

Signatures

  • Guloader,Cloudeye

    A shellcode based downloader first seen in 2020.

  • Executes dropped EXE 1 IoCs
  • Checks QEMU agent state file 2 TTPs 4 IoCs

    Checks state file used by QEMU agent, possibly to detect virtualization.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Loads dropped DLL 1 IoCs
  • Adds Run key to start application 2 TTPs 4 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Suspicious use of NtSetInformationThreadHideFromDebugger 4 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious behavior: MapViewOfSection 2 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 11 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\scan_004768.pdf.exe
    "C:\Users\Admin\AppData\Local\Temp\scan_004768.pdf.exe"
    1⤵
    • Checks QEMU agent state file
    • Adds Run key to start application
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Suspicious use of SetThreadContext
    • Suspicious behavior: MapViewOfSection
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:1604
    • C:\Users\Admin\AppData\Local\Temp\scan_004768.pdf.exe
      "C:\Users\Admin\AppData\Local\Temp\scan_004768.pdf.exe"
      2⤵
      • Checks QEMU agent state file
      • Checks computer location settings
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Suspicious use of WriteProcessMemory
      PID:3916
      • C:\Users\Admin\AppData\Local\Temp\inhellde\Vedismh8.exe
        "C:\Users\Admin\AppData\Local\Temp\inhellde\Vedismh8.exe"
        3⤵
        • Executes dropped EXE
        • Checks QEMU agent state file
        • Adds Run key to start application
        • Suspicious use of NtSetInformationThreadHideFromDebugger
        • Suspicious use of SetThreadContext
        • Suspicious behavior: MapViewOfSection
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:3768
        • C:\Users\Admin\AppData\Local\Temp\inhellde\Vedismh8.exe
          "C:\Users\Admin\AppData\Local\Temp\inhellde\Vedismh8.exe"
          4⤵
          • Checks QEMU agent state file
          • Loads dropped DLL
          • Suspicious use of NtSetInformationThreadHideFromDebugger
          PID:4652

Network

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Virtualization/Sandbox Evasion

1
T1497

Modify Registry

1
T1112

Discovery

Query Registry

2
T1012

Virtualization/Sandbox Evasion

1
T1497

System Information Discovery

2
T1082

Command and Control

Web Service

1
T1102

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\inhellde\Vedismh8.exe
    Filesize

    84KB

    MD5

    586552ad9112f084e84c2111cad12ec2

    SHA1

    48a50e32aefe8cc29de241c33a91e4ea6c9f7d4b

    SHA256

    bb5e9e2aea9052040d072c9c9b161d2d5a88c50b049e5a505b016e80910256a0

    SHA512

    93a35be4aaecae9a6e118af85ef78d4041ca54b8b18d1bfb6b7acd0827d8f05b1d3f399e9227ed1e5ff53ddaa44588d451d987a98e34f68f957d33a1049c7894

  • C:\Users\Admin\AppData\Local\Temp\inhellde\Vedismh8.exe
    Filesize

    84KB

    MD5

    586552ad9112f084e84c2111cad12ec2

    SHA1

    48a50e32aefe8cc29de241c33a91e4ea6c9f7d4b

    SHA256

    bb5e9e2aea9052040d072c9c9b161d2d5a88c50b049e5a505b016e80910256a0

    SHA512

    93a35be4aaecae9a6e118af85ef78d4041ca54b8b18d1bfb6b7acd0827d8f05b1d3f399e9227ed1e5ff53ddaa44588d451d987a98e34f68f957d33a1049c7894

  • C:\Users\Admin\AppData\Local\Temp\inhellde\Vedismh8.exe
    Filesize

    84KB

    MD5

    586552ad9112f084e84c2111cad12ec2

    SHA1

    48a50e32aefe8cc29de241c33a91e4ea6c9f7d4b

    SHA256

    bb5e9e2aea9052040d072c9c9b161d2d5a88c50b049e5a505b016e80910256a0

    SHA512

    93a35be4aaecae9a6e118af85ef78d4041ca54b8b18d1bfb6b7acd0827d8f05b1d3f399e9227ed1e5ff53ddaa44588d451d987a98e34f68f957d33a1049c7894

  • memory/1604-133-0x00007FFFB98B0000-0x00007FFFB9AA5000-memory.dmp
    Filesize

    2.0MB

  • memory/1604-138-0x00000000774D0000-0x0000000077673000-memory.dmp
    Filesize

    1.6MB

  • memory/1604-132-0x00000000021D0000-0x00000000021DE000-memory.dmp
    Filesize

    56KB

  • memory/3768-153-0x00000000774D0000-0x0000000077673000-memory.dmp
    Filesize

    1.6MB

  • memory/3768-148-0x00007FFFB98B0000-0x00007FFFB9AA5000-memory.dmp
    Filesize

    2.0MB

  • memory/3768-147-0x00000000005F0000-0x00000000005FE000-memory.dmp
    Filesize

    56KB

  • memory/3768-141-0x0000000000000000-mapping.dmp
  • memory/3916-137-0x0000000000401000-0x0000000000506000-memory.dmp
    Filesize

    1.0MB

  • memory/3916-144-0x00000000774D0000-0x0000000077673000-memory.dmp
    Filesize

    1.6MB

  • memory/3916-140-0x00007FFFB98B0000-0x00007FFFB9AA5000-memory.dmp
    Filesize

    2.0MB

  • memory/3916-139-0x0000000000560000-0x0000000000660000-memory.dmp
    Filesize

    1024KB

  • memory/3916-134-0x0000000000000000-mapping.dmp
  • memory/3916-135-0x0000000000400000-0x000000000055D000-memory.dmp
    Filesize

    1.4MB

  • memory/4652-149-0x0000000000000000-mapping.dmp
  • memory/4652-155-0x0000000000560000-0x0000000000660000-memory.dmp
    Filesize

    1024KB

  • memory/4652-156-0x00007FFFB98B0000-0x00007FFFB9AA5000-memory.dmp
    Filesize

    2.0MB

  • memory/4652-157-0x00000000774D0000-0x0000000077673000-memory.dmp
    Filesize

    1.6MB