Analysis

  • max time kernel
    127s
  • max time network
    143s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-12-2024 10:02

General

  • Target

    5182c93d80ab847541599124d388613c23bfb193b7879f5395b421bba5c568f6.exe

  • Size

    3.7MB

  • MD5

    cd765738ca380479232b3742bec4681a

  • SHA1

    72183452d01eabefa4a1dc4e4702df04aca6da4e

  • SHA256

    5182c93d80ab847541599124d388613c23bfb193b7879f5395b421bba5c568f6

  • SHA512

    047266f5d2f30661857c501c705a18128082551498351eee28600bfb051e276535e00abfa0dd30acbcdb01e9238958f06ca934abb094ee03666cae51475ed6f5

  • SSDEEP

    49152:sBe/wR+kPCndafDZ7MTpxKQ4vWcucxZIp6/Y6HhxVetUw5WxGea2rkoVAAVsK5Iw:/namVxrcxys/XhxsuwEUeFzyRM

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

CODE

C2

twart.myfirewall.org:9792

rency.ydns.eu:5287

wqo9.firewall-gateway.de:8841

Mutex

02351e291-5d041-4fa37-932c7-869aeiQec514992

Attributes
  • encryption_key

    3145298725BA5E0DD56E87FFE3F8898EA81E6EDA

  • install_name

    workbook.exe

  • log_directory

    Logs

  • reconnect_delay

    6000

  • startup_key

    workbook

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar family
  • Quasar payload 1 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Executes dropped EXE 3 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 12 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Scheduled Task/Job: Scheduled Task 1 TTPs 4 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 7 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 46 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\5182c93d80ab847541599124d388613c23bfb193b7879f5395b421bba5c568f6.exe
    "C:\Users\Admin\AppData\Local\Temp\5182c93d80ab847541599124d388613c23bfb193b7879f5395b421bba5c568f6.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2836
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\5182c93d80ab847541599124d388613c23bfb193b7879f5395b421bba5c568f6.exe"
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:3188
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\IoOrGePEOIrHFn.exe"
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2332
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\IoOrGePEOIrHFn" /XML "C:\Users\Admin\AppData\Local\Temp\tmpFB77.tmp"
      2⤵
      • System Location Discovery: System Language Discovery
      • Scheduled Task/Job: Scheduled Task
      PID:704
    • C:\Users\Admin\AppData\Local\Temp\5182c93d80ab847541599124d388613c23bfb193b7879f5395b421bba5c568f6.exe
      "C:\Users\Admin\AppData\Local\Temp\5182c93d80ab847541599124d388613c23bfb193b7879f5395b421bba5c568f6.exe"
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2012
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "workbook" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\workbook.exe" /rl HIGHEST /f
        3⤵
        • System Location Discovery: System Language Discovery
        • Scheduled Task/Job: Scheduled Task
        PID:2060
      • C:\Users\Admin\AppData\Roaming\SubDir\workbook.exe
        "C:\Users\Admin\AppData\Roaming\SubDir\workbook.exe"
        3⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • System Location Discovery: System Language Discovery
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3736
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\SubDir\workbook.exe"
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:756
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\IoOrGePEOIrHFn.exe"
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:4840
        • C:\Windows\SysWOW64\schtasks.exe
          "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\IoOrGePEOIrHFn" /XML "C:\Users\Admin\AppData\Local\Temp\tmp47B2.tmp"
          4⤵
          • System Location Discovery: System Language Discovery
          • Scheduled Task/Job: Scheduled Task
          PID:2468
        • C:\Users\Admin\AppData\Roaming\SubDir\workbook.exe
          "C:\Users\Admin\AppData\Roaming\SubDir\workbook.exe"
          4⤵
          • Executes dropped EXE
          PID:892
        • C:\Users\Admin\AppData\Roaming\SubDir\workbook.exe
          "C:\Users\Admin\AppData\Roaming\SubDir\workbook.exe"
          4⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:3132
          • C:\Windows\SysWOW64\schtasks.exe
            "schtasks" /create /tn "workbook" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\workbook.exe" /rl HIGHEST /f
            5⤵
            • System Location Discovery: System Language Discovery
            • Scheduled Task/Job: Scheduled Task
            PID:4708

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\5182c93d80ab847541599124d388613c23bfb193b7879f5395b421bba5c568f6.exe.log

    Filesize

    1KB

    MD5

    8ec831f3e3a3f77e4a7b9cd32b48384c

    SHA1

    d83f09fd87c5bd86e045873c231c14836e76a05c

    SHA256

    7667e538030e3f8ce2886e47a01af24cb0ea70528b1e821c5d8832c5076cb982

    SHA512

    26bffa2406b66368bd412bf25869a792631455645992cdcade2dbc13a2e56fb546414a6a9223b94c96c38d89187add6678d4779a88b38b0c9e36be8527b213c3

  • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log

    Filesize

    2KB

    MD5

    3d086a433708053f9bf9523e1d87a4e8

    SHA1

    b3ab5d4f282a4c8fe8c3005b8a557ed5a0e37f28

    SHA256

    6f8fd1b8d9788ad54eaeee329232187e24b7b43393a01aeba2d6e9675231fb69

    SHA512

    931ae42b4c68a4507ff2342332b08eb407050d47cf4176137ea022d0f6e513c689e998445a04c6d18d4877391705c586bfce0234632b898d41aaed0957996dfd

  • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

    Filesize

    18KB

    MD5

    897d5665aae976738f43f73c787b6224

    SHA1

    cb5c0d7d3b2ba273fe67d63142e584df36885796

    SHA256

    c1ab429c487f20abbca7021e0231f0041f2c4058953bbfd48ef08aca1b488a35

    SHA512

    3a72c04a85cc984417a9cc5824ae316cfff7462eb36b330cedc42724516fa4f6f5c9133ca08fa913fed538a4544f3bdd2e74b14185daeb5b8758de91be640b58

  • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

    Filesize

    18KB

    MD5

    f397054f2b732f7ef24f13e53e174796

    SHA1

    a01144fe646789246a69527637e990d7c2d7e01f

    SHA256

    3dedf90934bdb1763cae86ccd477222a559c9f206248ae518a68e88922b87b04

    SHA512

    b39d9d931d001394c1e97ae86cab341a6fb33413554584807ee7db0d034f6787e7655bb38797ae30293966bc149cbc3b0a39e93172a1a56f166b9d1bfab0d267

  • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_as0erqcs.2u4.ps1

    Filesize

    60B

    MD5

    d17fe0a3f47be24a6453e9ef58c94641

    SHA1

    6ab83620379fc69f80c0242105ddffd7d98d5d9d

    SHA256

    96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

    SHA512

    5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

  • C:\Users\Admin\AppData\Local\Temp\tmpFB77.tmp

    Filesize

    1KB

    MD5

    8507d23b7415cfac8d01cd0fc1991185

    SHA1

    cc2021a9dd6cd9bd952133c76a9be5418fd13b67

    SHA256

    252334fc1ee44ff55a05f0724a7beed2f02dd25961b9f9b58bacc07c7f9edc1a

    SHA512

    24d334a6d2d609d6016cf39601a7fefacc395122df32dc96d59485ac1f6eff339bf19d377a872768f656373d1f6f143e2e589e4c30091cb2c271c61558215262

  • C:\Users\Admin\AppData\Roaming\SubDir\workbook.exe

    Filesize

    3.7MB

    MD5

    cd765738ca380479232b3742bec4681a

    SHA1

    72183452d01eabefa4a1dc4e4702df04aca6da4e

    SHA256

    5182c93d80ab847541599124d388613c23bfb193b7879f5395b421bba5c568f6

    SHA512

    047266f5d2f30661857c501c705a18128082551498351eee28600bfb051e276535e00abfa0dd30acbcdb01e9238958f06ca934abb094ee03666cae51475ed6f5

  • memory/756-148-0x0000000007AF0000-0x0000000007B01000-memory.dmp

    Filesize

    68KB

  • memory/756-134-0x0000000007780000-0x0000000007823000-memory.dmp

    Filesize

    652KB

  • memory/756-123-0x0000000006610000-0x000000000665C000-memory.dmp

    Filesize

    304KB

  • memory/756-124-0x0000000070D10000-0x0000000070D5C000-memory.dmp

    Filesize

    304KB

  • memory/756-149-0x0000000007B30000-0x0000000007B44000-memory.dmp

    Filesize

    80KB

  • memory/2012-46-0x0000000000400000-0x0000000000724000-memory.dmp

    Filesize

    3.1MB

  • memory/2332-86-0x0000000007800000-0x0000000007814000-memory.dmp

    Filesize

    80KB

  • memory/2332-44-0x00000000745B0000-0x0000000074D60000-memory.dmp

    Filesize

    7.7MB

  • memory/2332-72-0x0000000074E60000-0x0000000074EAC000-memory.dmp

    Filesize

    304KB

  • memory/2332-95-0x00000000745B0000-0x0000000074D60000-memory.dmp

    Filesize

    7.7MB

  • memory/2332-25-0x00000000745B0000-0x0000000074D60000-memory.dmp

    Filesize

    7.7MB

  • memory/2332-45-0x00000000745B0000-0x0000000074D60000-memory.dmp

    Filesize

    7.7MB

  • memory/2332-89-0x00000000078E0000-0x00000000078E8000-memory.dmp

    Filesize

    32KB

  • memory/2836-8-0x00000000745B0000-0x0000000074D60000-memory.dmp

    Filesize

    7.7MB

  • memory/2836-9-0x0000000006040000-0x00000000063A8000-memory.dmp

    Filesize

    3.4MB

  • memory/2836-1-0x00000000001C0000-0x000000000056C000-memory.dmp

    Filesize

    3.7MB

  • memory/2836-2-0x0000000007840000-0x0000000007DE4000-memory.dmp

    Filesize

    5.6MB

  • memory/2836-0-0x00000000745BE000-0x00000000745BF000-memory.dmp

    Filesize

    4KB

  • memory/2836-10-0x0000000006910000-0x00000000069AC000-memory.dmp

    Filesize

    624KB

  • memory/2836-48-0x00000000745B0000-0x0000000074D60000-memory.dmp

    Filesize

    7.7MB

  • memory/2836-3-0x0000000007330000-0x00000000073C2000-memory.dmp

    Filesize

    584KB

  • memory/2836-7-0x00000000745BE000-0x00000000745BF000-memory.dmp

    Filesize

    4KB

  • memory/2836-6-0x0000000007450000-0x0000000007468000-memory.dmp

    Filesize

    96KB

  • memory/2836-5-0x00000000028B0000-0x00000000028BA000-memory.dmp

    Filesize

    40KB

  • memory/2836-4-0x00000000745B0000-0x0000000074D60000-memory.dmp

    Filesize

    7.7MB

  • memory/3132-145-0x0000000006A00000-0x0000000007018000-memory.dmp

    Filesize

    6.1MB

  • memory/3132-147-0x0000000006800000-0x00000000068B2000-memory.dmp

    Filesize

    712KB

  • memory/3132-146-0x0000000006590000-0x00000000065E0000-memory.dmp

    Filesize

    320KB

  • memory/3188-18-0x00000000745B0000-0x0000000074D60000-memory.dmp

    Filesize

    7.7MB

  • memory/3188-96-0x00000000745B0000-0x0000000074D60000-memory.dmp

    Filesize

    7.7MB

  • memory/3188-82-0x0000000007170000-0x000000000717A000-memory.dmp

    Filesize

    40KB

  • memory/3188-52-0x0000000006DD0000-0x0000000006E02000-memory.dmp

    Filesize

    200KB

  • memory/3188-83-0x0000000007380000-0x0000000007416000-memory.dmp

    Filesize

    600KB

  • memory/3188-84-0x0000000007300000-0x0000000007311000-memory.dmp

    Filesize

    68KB

  • memory/3188-85-0x0000000007330000-0x000000000733E000-memory.dmp

    Filesize

    56KB

  • memory/3188-70-0x0000000007740000-0x0000000007DBA000-memory.dmp

    Filesize

    6.5MB

  • memory/3188-87-0x0000000007440000-0x000000000745A000-memory.dmp

    Filesize

    104KB

  • memory/3188-88-0x0000000007420000-0x0000000007428000-memory.dmp

    Filesize

    32KB

  • memory/3188-64-0x0000000007010000-0x00000000070B3000-memory.dmp

    Filesize

    652KB

  • memory/3188-53-0x0000000074E60000-0x0000000074EAC000-memory.dmp

    Filesize

    304KB

  • memory/3188-63-0x00000000063C0000-0x00000000063DE000-memory.dmp

    Filesize

    120KB

  • memory/3188-71-0x0000000007100000-0x000000000711A000-memory.dmp

    Filesize

    104KB

  • memory/3188-49-0x0000000005DE0000-0x0000000005DFE000-memory.dmp

    Filesize

    120KB

  • memory/3188-15-0x00000000024B0000-0x00000000024E6000-memory.dmp

    Filesize

    216KB

  • memory/3188-50-0x0000000006340000-0x000000000638C000-memory.dmp

    Filesize

    304KB

  • memory/3188-33-0x00000000745B0000-0x0000000074D60000-memory.dmp

    Filesize

    7.7MB

  • memory/3188-27-0x00000000057C0000-0x0000000005826000-memory.dmp

    Filesize

    408KB

  • memory/3188-16-0x00000000050B0000-0x00000000056D8000-memory.dmp

    Filesize

    6.2MB

  • memory/3188-32-0x0000000005830000-0x0000000005B84000-memory.dmp

    Filesize

    3.3MB

  • memory/3188-22-0x0000000005020000-0x0000000005042000-memory.dmp

    Filesize

    136KB

  • memory/3188-26-0x0000000005750000-0x00000000057B6000-memory.dmp

    Filesize

    408KB

  • memory/3188-17-0x00000000745B0000-0x0000000074D60000-memory.dmp

    Filesize

    7.7MB

  • memory/4840-135-0x0000000070D10000-0x0000000070D5C000-memory.dmp

    Filesize

    304KB

  • memory/4840-99-0x0000000006110000-0x0000000006464000-memory.dmp

    Filesize

    3.3MB