Analysis

  • max time kernel
    60s
  • max time network
    125s
  • platform
    windows7_x64
  • resource
    win7-20220901-en
  • resource tags

    arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
  • submitted
    11-11-2022 04:23

General

  • Target

    Set_Yuki_x64.exe

  • Size

    6.1MB

  • MD5

    8a179d54a162d143f19fd7064e361c05

  • SHA1

    4f0cd167e6c22efd4e31357de7e4c66625bf7032

  • SHA256

    434f45359039b25ca4aaca82742c6a5f5317ad2a01c4146a53bc3fc5c2d7703b

  • SHA512

    4112f0f510735b0aa72c2119310aa182354f8aa12d8b9ec4e0c6861de1dcffe4ef491b6e7399de66204e4f4d083f3e879d822a7f3dc7775b86b5c307245b9f16

  • SSDEEP

    24576:uv66t3q/zhIYCpnviF18f5xn/T8BlnpvgSHhD:JsqlRuxn/T8j6s

Malware Config

Extracted

Family

vidar

Version

55.6

Botnet

1325

C2

https://t.me/seclab_new

https://koyu.space/@ofade

Attributes
  • profile_id

    1325

Signatures

  • Vidar

    Vidar is an infostealer based on Arkei stealer.

  • Downloads MZ/PE file
  • Executes dropped EXE 1 IoCs
  • UPX packed file 5 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Deletes itself 1 IoCs
  • Loads dropped DLL 4 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses 2FA software files, possible credential harvesting 2 TTPs
  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Enumerates physical storage devices 1 TTPs

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

  • Checks processor information in registry 2 TTPs 2 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Delays execution with timeout.exe 1 IoCs
  • GoLang User-Agent 1 IoCs

    Uses default user-agent string defined by GoLang HTTP packages.

  • Modifies system certificate store 2 TTPs 8 IoCs
  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Set_Yuki_x64.exe
    "C:\Users\Admin\AppData\Local\Temp\Set_Yuki_x64.exe"
    1⤵
    • Loads dropped DLL
    • Checks processor information in registry
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1168
    • C:\ProgramData\03704990424722255249.exe
      "C:\ProgramData\03704990424722255249.exe"
      2⤵
      • Executes dropped EXE
      PID:1916
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\Temp\Set_Yuki_x64.exe" & exit
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:1932
      • C:\Windows\SysWOW64\timeout.exe
        timeout /t 6
        3⤵
        • Delays execution with timeout.exe
        PID:1720

Network

MITRE ATT&CK Matrix ATT&CK v6

Defense Evasion

Install Root Certificate

1
T1130

Modify Registry

1
T1112

Credential Access

Credentials in Files

3
T1081

Discovery

Query Registry

2
T1012

System Information Discovery

2
T1082

Collection

Data from Local System

3
T1005

Command and Control

Web Service

1
T1102

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\ProgramData\03704990424722255249.exe
    Filesize

    2.8MB

    MD5

    4a123c0fa6f2d458997a8d92d6ace7ae

    SHA1

    dc83bde87f0af8412c0784abf4a89ee4ad873427

    SHA256

    2d360d6c5d5036729a10bb2221630f380cad96e9f7c78b257e086cb26d975a44

    SHA512

    67c655625d319e3626735dfe6c6b1241fbdcd44b7da3d9342ff1f876c08ab8c9314adae08c403a15d55a71cc0d10c0c05f5b345bcba491325f6799615ef55f35

  • \ProgramData\03704990424722255249.exe
    Filesize

    2.8MB

    MD5

    4a123c0fa6f2d458997a8d92d6ace7ae

    SHA1

    dc83bde87f0af8412c0784abf4a89ee4ad873427

    SHA256

    2d360d6c5d5036729a10bb2221630f380cad96e9f7c78b257e086cb26d975a44

    SHA512

    67c655625d319e3626735dfe6c6b1241fbdcd44b7da3d9342ff1f876c08ab8c9314adae08c403a15d55a71cc0d10c0c05f5b345bcba491325f6799615ef55f35

  • \ProgramData\03704990424722255249.exe
    Filesize

    2.8MB

    MD5

    4a123c0fa6f2d458997a8d92d6ace7ae

    SHA1

    dc83bde87f0af8412c0784abf4a89ee4ad873427

    SHA256

    2d360d6c5d5036729a10bb2221630f380cad96e9f7c78b257e086cb26d975a44

    SHA512

    67c655625d319e3626735dfe6c6b1241fbdcd44b7da3d9342ff1f876c08ab8c9314adae08c403a15d55a71cc0d10c0c05f5b345bcba491325f6799615ef55f35

  • \ProgramData\mozglue.dll
    Filesize

    593KB

    MD5

    c8fd9be83bc728cc04beffafc2907fe9

    SHA1

    95ab9f701e0024cedfbd312bcfe4e726744c4f2e

    SHA256

    ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a

    SHA512

    fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040

  • \ProgramData\nss3.dll
    Filesize

    2.0MB

    MD5

    1cc453cdf74f31e4d913ff9c10acdde2

    SHA1

    6e85eae544d6e965f15fa5c39700fa7202f3aafe

    SHA256

    ac5c92fe6c51cfa742e475215b83b3e11a4379820043263bf50d4068686c6fa5

    SHA512

    dd9ff4e06b00dc831439bab11c10e9b2ae864ea6e780d3835ea7468818f35439f352ef137da111efcdf2bb6465f6ca486719451bf6cf32c6a4420a56b1d64571

  • memory/1168-54-0x0000000000270000-0x00000000002D0000-memory.dmp
    Filesize

    384KB

  • memory/1168-59-0x0000000061E00000-0x0000000061EF3000-memory.dmp
    Filesize

    972KB

  • memory/1168-58-0x00000000760E1000-0x00000000760E3000-memory.dmp
    Filesize

    8KB

  • memory/1168-83-0x0000000028F00000-0x00000000296EB000-memory.dmp
    Filesize

    7.9MB

  • memory/1168-84-0x0000000028F00000-0x00000000296EB000-memory.dmp
    Filesize

    7.9MB

  • memory/1720-88-0x0000000000000000-mapping.dmp
  • memory/1916-81-0x0000000000000000-mapping.dmp
  • memory/1916-85-0x0000000000D60000-0x000000000154B000-memory.dmp
    Filesize

    7.9MB

  • memory/1916-86-0x0000000000D60000-0x000000000154B000-memory.dmp
    Filesize

    7.9MB

  • memory/1932-87-0x0000000000000000-mapping.dmp