Overview

overview

10

Static

static

3

Bloxstrap.exe

windows10-2004-x64

10

Bloxstrap.exe

windows11-21h2-x64

1

Sharing

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General

  • Target

    Bloxstrap.exe

  • Size

    7.6MB

  • Sample

    240527-lw62xsff8y

  • MD5

    dbb820772caf0003967ef0f269fbdeb1

  • SHA1

    31992bd4977a7dfeba67537a2da6c9ca64bc304c

  • SHA256

    b2ac1e407ed3ecd7c7faa6de929a68fb51145662cf793c40b69eb59295bba6bc

  • SHA512

    e8ac879c7198dffb78bc6ee4ad49b5de40a5a7dbbda53d427d0a034941487d13c8bb2b8d590a1fcdd81cd6abb8f21fdfcd52924eb00c45a42ee06c1e4b3d590f

  • SSDEEP

    98304:XNd5DSd5DxTsed5D2ZT00UuOYoHwfLk3vSmaR0+Mc4AN0edaAHDfysrTl1:X+sdtObAbN0u

Score
10/10
quasaroffice04spywarestealertrojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

10.127.0.97:9090

Mutex

3fb73ee1-4fa6-45cb-94cb-7668845a3358

Attributes
  • encryption_key

    694F4A28289046081419A7765A6B471BB8E19CE7

  • install_name

    rozz.exe

  • log_directory

    Logs

  • reconnect_delay

    1

  • startup_key

    rozzlacurt

  • subdirectory

    nig

Targets

    • Target

      Bloxstrap.exe

    • Size

      7.6MB

    • MD5

      dbb820772caf0003967ef0f269fbdeb1

    • SHA1

      31992bd4977a7dfeba67537a2da6c9ca64bc304c

    • SHA256

      b2ac1e407ed3ecd7c7faa6de929a68fb51145662cf793c40b69eb59295bba6bc

    • SHA512

      e8ac879c7198dffb78bc6ee4ad49b5de40a5a7dbbda53d427d0a034941487d13c8bb2b8d590a1fcdd81cd6abb8f21fdfcd52924eb00c45a42ee06c1e4b3d590f

    • SSDEEP

      98304:XNd5DSd5DxTsed5D2ZT00UuOYoHwfLk3vSmaR0+Mc4AN0edaAHDfysrTl1:X+sdtObAbN0u

    Score
    10/10
    quasaroffice04spywarestealertrojan

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

      trojanspywarequasar

    • Quasar payload

    • Checks computer location settings

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

    • Executes dropped EXE

    • Reads WinSCP keys stored on the system

      Tries to access WinSCP stored sessions.

      spywarestealer

    • Reads user/profile data of web browsers

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

      spywarestealer

    • Legitimate hosting services abused for malware hosting/C2

    behavioral1behavioral2

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Scheduled Task/Job

1
T1053

Command and Scripting Interpreter

1
T1059

Persistence

Scheduled Task/Job

1
T1053

Privilege Escalation

Scheduled Task/Job

1
T1053

Defense Evasion

Modify Registry

1
T1112

Credential Access

Unsecured Credentials

2
T1552

Credentials In Files

1
T1552.001

Credentials in Registry

1
T1552.002

Discovery

Query Registry

3
T1012

System Information Discovery

4
T1082

Lateral Movement

Collection

Data from Local System

2
T1005

Exfiltration

Command and Control

Web Service

1
T1102

Impact

Resource Development

Reconnaissance

Tasks