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Analysis

  • max time kernel
    149s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    18/01/2025, 21:12

General

  • Target

    RC7old.exe

  • Size

    3.1MB

  • MD5

    5efb08d03470612d11124136accc84fa

  • SHA1

    46abe602f6566ff6103f504ef8ae73f43eae19c1

  • SHA256

    853cf003dd01ec972a222a28b1e8b260fb06fab20245e609cb7df103d110343f

  • SHA512

    13a1fbeae357662e2e2a60e511a3bce2f63fef40a96ba49f25e745dd466ca3da24de5155f0f2233e8d15941f353a21df14247ab7b4ebf84ee419ca7d7b7ae74a

  • SSDEEP

    49152:CvHI22SsaNYfdPBldt698dBcjHuYREEf/yk/65LoGdvYAFTHHB72eh2NT:Cvo22SsaNYfdPBldt6+dBcjHuYRkp

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

RC7old

C2

yellow-parts.gl.at.ply.gg:52085

Mutex

8356bffd-2b62-44f9-937c-4adee31d9ea3

Attributes
  • encryption_key

    5471C1CD3CF5D10BA14E0A632D9E07BC5FEE0E2B

  • install_name

    RC7old.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    System

  • subdirectory

    System

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar family
  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 5 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\RC7old.exe
    "C:\Users\Admin\AppData\Local\Temp\RC7old.exe"
    1⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4204
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "System" /sc ONLOGON /tr "C:\Windows\system32\System\RC7old.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:2468
    • C:\Windows\system32\System\RC7old.exe
      "C:\Windows\system32\System\RC7old.exe"
      2⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of WriteProcessMemory
      PID:2996
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "System" /sc ONLOGON /tr "C:\Windows\system32\System\RC7old.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:3620

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\RC7old.exe.log

    Filesize

    1KB

    MD5

    baf55b95da4a601229647f25dad12878

    SHA1

    abc16954ebfd213733c4493fc1910164d825cac8

    SHA256

    ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

    SHA512

    24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

  • C:\Windows\System32\System\RC7old.exe

    Filesize

    3.1MB

    MD5

    5efb08d03470612d11124136accc84fa

    SHA1

    46abe602f6566ff6103f504ef8ae73f43eae19c1

    SHA256

    853cf003dd01ec972a222a28b1e8b260fb06fab20245e609cb7df103d110343f

    SHA512

    13a1fbeae357662e2e2a60e511a3bce2f63fef40a96ba49f25e745dd466ca3da24de5155f0f2233e8d15941f353a21df14247ab7b4ebf84ee419ca7d7b7ae74a

  • memory/2996-11-0x00007FFD6D400000-0x00007FFD6DEC1000-memory.dmp

    Filesize

    10.8MB

  • memory/2996-12-0x00007FFD6D400000-0x00007FFD6DEC1000-memory.dmp

    Filesize

    10.8MB

  • memory/2996-13-0x000000001C5B0000-0x000000001C600000-memory.dmp

    Filesize

    320KB

  • memory/2996-14-0x000000001C6C0000-0x000000001C772000-memory.dmp

    Filesize

    712KB

  • memory/2996-15-0x00007FFD6D400000-0x00007FFD6DEC1000-memory.dmp

    Filesize

    10.8MB

  • memory/4204-0-0x00007FFD6D403000-0x00007FFD6D405000-memory.dmp

    Filesize

    8KB

  • memory/4204-1-0x0000000000790000-0x0000000000AB4000-memory.dmp

    Filesize

    3.1MB

  • memory/4204-2-0x00007FFD6D400000-0x00007FFD6DEC1000-memory.dmp

    Filesize

    10.8MB

  • memory/4204-10-0x00007FFD6D400000-0x00007FFD6DEC1000-memory.dmp

    Filesize

    10.8MB