Overview

overview

10

Static

static

10

Update.exe

windows10-1703-x64

10

Update.exe

windows10-2004-x64

Update.exe

windows11-21h2-x64

Sharing

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General

  • Target

    Update.exe

  • Size

    409KB

  • Sample

    240421-vvdtesfh36

  • MD5

    93cd801b9e5e90edab480d3c1c135271

  • SHA1

    b0c7e918ade7a47916603ebd9eb1e3b4d78062c2

  • SHA256

    89996d761395b9e79589c4c7c93cc21ae2b5a00a9ba8c46abbf395954f3d0133

  • SHA512

    a5e207744fcb100fb24935ecda4c4214ac4cc7aca666b589fa1c451f1ad24c5a573cfe1b8150ac5510a866bb800251aa6ebf3fd685ed7a2e5fbc482791e143ed

  • SSDEEP

    6144:0rBUymyfpwzeiqv6Ef3RB17bdzjyue7zKINbuz2vcDJ8vtVQY:eBwz9/Ef3RB17FyuYKIQXDJ8vtCY

Score
10/10
quasarslavespywaretrojan

Malware Config

Extracted

Family

quasar

Version

3.1.5

Botnet

SLAVE

C2

147.185.221.19:33587

Mutex

$Sxr-zpFqsQjJJh3miBvVnu

Attributes
  • encryption_key

    w1TSUMSbvOFQ9whpYTwH

  • install_name

    BiosUpdX64YDPS.exe

  • log_directory

    $sxr

  • reconnect_delay

    3000

  • startup_key

    $sxr-mtsha

  • subdirectory

    Windows

Targets

    • Target

      Update.exe

    • Size

      409KB

    • MD5

      93cd801b9e5e90edab480d3c1c135271

    • SHA1

      b0c7e918ade7a47916603ebd9eb1e3b4d78062c2

    • SHA256

      89996d761395b9e79589c4c7c93cc21ae2b5a00a9ba8c46abbf395954f3d0133

    • SHA512

      a5e207744fcb100fb24935ecda4c4214ac4cc7aca666b589fa1c451f1ad24c5a573cfe1b8150ac5510a866bb800251aa6ebf3fd685ed7a2e5fbc482791e143ed

    • SSDEEP

      6144:0rBUymyfpwzeiqv6Ef3RB17bdzjyue7zKINbuz2vcDJ8vtVQY:eBwz9/Ef3RB17FyuYKIQXDJ8vtCY

    Score
    10/10
    quasarslavespywaretrojan

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

      trojanspywarequasar

    • Quasar payload

    • Suspicious use of NtCreateUserProcessOtherParentProcess

    • Downloads MZ/PE file

    • Executes dropped EXE

    • Legitimate hosting services abused for malware hosting/C2

    • Looks up external IP address via web service

      Uses a legitimate IP lookup service to find the infected system's external IP.

    • Drops file in System32 directory

    • Suspicious use of SetThreadContext

    behavioral1behavioral2behavioral3

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Scheduled Task/Job

1
T1053

Persistence

Scheduled Task/Job

1
T1053

Privilege Escalation

Scheduled Task/Job

1
T1053

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Web Service

1
T1102

Impact

Resource Development

Reconnaissance

Tasks