Analysis

  • max time kernel
    105s
  • max time network
    142s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20250314-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
  • submitted
    26/03/2025, 19:28

General

  • Target

    95586fa277668206c164bcc7af2d92602bf6a993b9f7fda951bbd9fd3342e3eb.exe

  • Size

    3.6MB

  • MD5

    69f3bc0083e17e7c28d06140308b12d8

  • SHA1

    3d637938626dbb7e63be9da10b83a94997f87f5c

  • SHA256

    95586fa277668206c164bcc7af2d92602bf6a993b9f7fda951bbd9fd3342e3eb

  • SHA512

    8f5b3ea0d36a6f7b16a25aa69d9ba93ba2e60e01c48124d049177a9e4b8bc104fa1fabe37eb3cc7b1b39339b15388e6ae89b552d8aae23ffad1b225df9d14681

  • SSDEEP

    98304:wqiCGJV+6YRVnvrjgZQBB1pKOnTHq3IJYAsUx81J:wXCCYRVnvKOjq4SAsV7

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

BZ EMY

C2

bz-fnd3.ydns.eu:9841

wqo9.firewall-gateway.de:9792

Mutex

d9ad6O0279-3e005-4045-b50a-d6b5ff71d693

Attributes
  • encryption_key

    3145298725BA5E0DD56E87FFE3F8898EA81E6EDA

  • install_name

    MSworkbooks.exe

  • log_directory

    Logs

  • reconnect_delay

    6000

  • startup_key

    MSworkbook

  • 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 2 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 2 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 10 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 9 IoCs
  • Suspicious use of AdjustPrivilegeToken 6 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 37 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\95586fa277668206c164bcc7af2d92602bf6a993b9f7fda951bbd9fd3342e3eb.exe
    "C:\Users\Admin\AppData\Local\Temp\95586fa277668206c164bcc7af2d92602bf6a993b9f7fda951bbd9fd3342e3eb.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4012
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\AFENhLHxFPepR.exe"
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:5812
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\AFENhLHxFPepR" /XML "C:\Users\Admin\AppData\Local\Temp\tmpABFF.tmp"
      2⤵
      • System Location Discovery: System Language Discovery
      • Scheduled Task/Job: Scheduled Task
      PID:4708
    • C:\Users\Admin\AppData\Local\Temp\95586fa277668206c164bcc7af2d92602bf6a993b9f7fda951bbd9fd3342e3eb.exe
      "C:\Users\Admin\AppData\Local\Temp\95586fa277668206c164bcc7af2d92602bf6a993b9f7fda951bbd9fd3342e3eb.exe"
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:3356
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "MSworkbook" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\MSworkbooks.exe" /rl HIGHEST /f
        3⤵
        • System Location Discovery: System Language Discovery
        • Scheduled Task/Job: Scheduled Task
        PID:5308
      • C:\Users\Admin\AppData\Roaming\SubDir\MSworkbooks.exe
        "C:\Users\Admin\AppData\Roaming\SubDir\MSworkbooks.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:5140
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\AFENhLHxFPepR.exe"
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:5136
        • C:\Windows\SysWOW64\schtasks.exe
          "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\AFENhLHxFPepR" /XML "C:\Users\Admin\AppData\Local\Temp\tmpF77F.tmp"
          4⤵
          • System Location Discovery: System Language Discovery
          • Scheduled Task/Job: Scheduled Task
          PID:5076
        • C:\Users\Admin\AppData\Roaming\SubDir\MSworkbooks.exe
          "C:\Users\Admin\AppData\Roaming\SubDir\MSworkbooks.exe"
          4⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:2000
          • C:\Windows\SysWOW64\schtasks.exe
            "schtasks" /create /tn "MSworkbook" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\MSworkbooks.exe" /rl HIGHEST /f
            5⤵
            • System Location Discovery: System Language Discovery
            • Scheduled Task/Job: Scheduled Task
            PID:2248

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\95586fa277668206c164bcc7af2d92602bf6a993b9f7fda951bbd9fd3342e3eb.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

    968cb9309758126772781b83adb8a28f

    SHA1

    8da30e71accf186b2ba11da1797cf67f8f78b47c

    SHA256

    92099c10776bb7e3f2a8d1b82d4d40d0c4627e4f1bf754a6e58dfd2c2e97042a

    SHA512

    4bd50732f8af4d688d95999bddfd296115d7033ddc38f86c9fb1f47fde202bffa27e9088bebcaa3064ca946af2f5c1ca6cbde49d0907f0005c7ab42874515dd3

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

    Filesize

    18KB

    MD5

    29e0828a0c0a47dcbf4edf5f7bc840c4

    SHA1

    ce22beba4c59ac80190ac79f94e29bbdafc2250b

    SHA256

    54b21c0a6589e3894f5582ed394d0b1a820b48946a03bec74d2eb2bffc8ae51e

    SHA512

    6279647729faf8a9fccc96bf42eb37d31173a5948ada1935fb9478c5c6ea4781e1212ec3ae2bdbc7fc680db695a01a7ff19c431d230ecda4251808df7c1d7976

  • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ma3bfgb0.rsx.ps1

    Filesize

    60B

    MD5

    d17fe0a3f47be24a6453e9ef58c94641

    SHA1

    6ab83620379fc69f80c0242105ddffd7d98d5d9d

    SHA256

    96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

    SHA512

    5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

    Filesize

    1KB

    MD5

    0adfcb7ef0b18b5875ffb18c06f95fb9

    SHA1

    3b046d4aae7ae0e50772e8201911743cd72dc2c0

    SHA256

    134a511e0878f88c5730c1e18b4c64c7461f6afc88296658afb009e06af0b3e0

    SHA512

    c5bef06f341d84e251ab185b4b12776502415226f4c58fb35790fccab354914650cf68da47520af47c63ea09b0910adc6344bd9f2fedd25046da806f099e5e50

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

    Filesize

    3.6MB

    MD5

    69f3bc0083e17e7c28d06140308b12d8

    SHA1

    3d637938626dbb7e63be9da10b83a94997f87f5c

    SHA256

    95586fa277668206c164bcc7af2d92602bf6a993b9f7fda951bbd9fd3342e3eb

    SHA512

    8f5b3ea0d36a6f7b16a25aa69d9ba93ba2e60e01c48124d049177a9e4b8bc104fa1fabe37eb3cc7b1b39339b15388e6ae89b552d8aae23ffad1b225df9d14681

  • memory/2000-100-0x0000000006430000-0x0000000006480000-memory.dmp

    Filesize

    320KB

  • memory/2000-107-0x0000000007C80000-0x0000000007C92000-memory.dmp

    Filesize

    72KB

  • memory/2000-99-0x00000000068E0000-0x0000000006EF8000-memory.dmp

    Filesize

    6.1MB

  • memory/2000-101-0x00000000066A0000-0x0000000006752000-memory.dmp

    Filesize

    712KB

  • memory/2000-108-0x0000000007CE0000-0x0000000007D1C000-memory.dmp

    Filesize

    240KB

  • memory/3356-34-0x0000000000400000-0x0000000000724000-memory.dmp

    Filesize

    3.1MB

  • memory/4012-4-0x00000000059D0000-0x00000000059DA000-memory.dmp

    Filesize

    40KB

  • memory/4012-0-0x0000000074F8E000-0x0000000074F8F000-memory.dmp

    Filesize

    4KB

  • memory/4012-6-0x0000000005BE0000-0x0000000005BF0000-memory.dmp

    Filesize

    64KB

  • memory/4012-7-0x0000000074F8E000-0x0000000074F8F000-memory.dmp

    Filesize

    4KB

  • memory/4012-5-0x0000000074F80000-0x0000000075730000-memory.dmp

    Filesize

    7.7MB

  • memory/4012-10-0x0000000008D90000-0x0000000008E2C000-memory.dmp

    Filesize

    624KB

  • memory/4012-3-0x0000000005810000-0x00000000058A2000-memory.dmp

    Filesize

    584KB

  • memory/4012-2-0x0000000005E80000-0x0000000006424000-memory.dmp

    Filesize

    5.6MB

  • memory/4012-9-0x0000000008570000-0x00000000088D8000-memory.dmp

    Filesize

    3.4MB

  • memory/4012-1-0x0000000000AB0000-0x0000000000E46000-memory.dmp

    Filesize

    3.6MB

  • memory/4012-8-0x0000000074F80000-0x0000000075730000-memory.dmp

    Filesize

    7.7MB

  • memory/4012-36-0x0000000074F80000-0x0000000075730000-memory.dmp

    Filesize

    7.7MB

  • memory/5136-103-0x0000000007400000-0x0000000007414000-memory.dmp

    Filesize

    80KB

  • memory/5136-87-0x0000000005EC0000-0x0000000005F0C000-memory.dmp

    Filesize

    304KB

  • memory/5136-88-0x0000000071120000-0x000000007116C000-memory.dmp

    Filesize

    304KB

  • memory/5136-98-0x0000000007050000-0x00000000070F3000-memory.dmp

    Filesize

    652KB

  • memory/5136-102-0x00000000073D0000-0x00000000073E1000-memory.dmp

    Filesize

    68KB

  • memory/5136-76-0x00000000057D0000-0x0000000005B24000-memory.dmp

    Filesize

    3.3MB

  • memory/5812-18-0x0000000004BF0000-0x0000000005218000-memory.dmp

    Filesize

    6.2MB

  • memory/5812-57-0x0000000006C10000-0x0000000006CB3000-memory.dmp

    Filesize

    652KB

  • memory/5812-59-0x0000000006D20000-0x0000000006D3A000-memory.dmp

    Filesize

    104KB

  • memory/5812-58-0x0000000007360000-0x00000000079DA000-memory.dmp

    Filesize

    6.5MB

  • memory/5812-60-0x0000000006D90000-0x0000000006D9A000-memory.dmp

    Filesize

    40KB

  • memory/5812-61-0x0000000006FA0000-0x0000000007036000-memory.dmp

    Filesize

    600KB

  • memory/5812-62-0x0000000006F20000-0x0000000006F31000-memory.dmp

    Filesize

    68KB

  • memory/5812-63-0x0000000006F50000-0x0000000006F5E000-memory.dmp

    Filesize

    56KB

  • memory/5812-64-0x0000000006F60000-0x0000000006F74000-memory.dmp

    Filesize

    80KB

  • memory/5812-65-0x0000000007060000-0x000000000707A000-memory.dmp

    Filesize

    104KB

  • memory/5812-66-0x0000000007040000-0x0000000007048000-memory.dmp

    Filesize

    32KB

  • memory/5812-69-0x0000000074F80000-0x0000000075730000-memory.dmp

    Filesize

    7.7MB

  • memory/5812-56-0x0000000006BC0000-0x0000000006BDE000-memory.dmp

    Filesize

    120KB

  • memory/5812-45-0x0000000005FC0000-0x0000000005FF2000-memory.dmp

    Filesize

    200KB

  • memory/5812-46-0x0000000075830000-0x000000007587C000-memory.dmp

    Filesize

    304KB

  • memory/5812-38-0x0000000005AA0000-0x0000000005AEC000-memory.dmp

    Filesize

    304KB

  • memory/5812-37-0x00000000059E0000-0x00000000059FE000-memory.dmp

    Filesize

    120KB

  • memory/5812-33-0x00000000052D0000-0x0000000005624000-memory.dmp

    Filesize

    3.3MB

  • memory/5812-22-0x0000000004AC0000-0x0000000004B26000-memory.dmp

    Filesize

    408KB

  • memory/5812-23-0x0000000004B30000-0x0000000004B96000-memory.dmp

    Filesize

    408KB

  • memory/5812-21-0x0000000004A20000-0x0000000004A42000-memory.dmp

    Filesize

    136KB

  • memory/5812-17-0x0000000074F80000-0x0000000075730000-memory.dmp

    Filesize

    7.7MB

  • memory/5812-19-0x0000000074F80000-0x0000000075730000-memory.dmp

    Filesize

    7.7MB

  • memory/5812-16-0x0000000074F80000-0x0000000075730000-memory.dmp

    Filesize

    7.7MB

  • memory/5812-15-0x0000000002100000-0x0000000002136000-memory.dmp

    Filesize

    216KB