quasar | 90274cb01d2338b24b4f8cde12c7ba5931a89f4a2a757156caf4d45d9e26048f

Analysis

max time kernel
144s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
16/01/2024, 19:56

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General

Target
Client-built.exe
Size 3.1MB
Sample240116-ynxjqsaec4
SHA256 90274cb01d2338b24b4f8cde12c7ba5931a89f4a2a757156caf4d45d9e26048f
MD5 cbafbe5b11ab6af2912656e97c323d0d
SHA1 22e04ff858e1f40db3c6d98a04975e1e50b03cc1
SHA512 ba507dce3425547f4defcd7764f169088353c8e59a7a6293ce7892882d9bc6de74a0576cc0ec67c5b916cf3a6d3c9c4e4bff21068e8915aa6efe1abd4db5390d
SSDEEP 49152:yvkt62XlaSFNWPjljiFa2RoUYIqcgRZmzxFWGdUTHHB72eh2NT:yv462XlaSFNWPjljiFXRoUYIqcgR8
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

5.tcp.eu.ngrok.io:13500

Mutex

4281bb26-39f4-4beb-803d-ca182c627b5b

Attributes

encryption_key
7242CEDE72B39FB252FB658332932C4B65FCDA7F
install_name
Word.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Client Startup
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar

Quasar payload 3 IoCs

resource	yara_rule
behavioral2/memory/1984-0-0x0000000000FC0000-0x00000000012E4000-memory.dmp	family_quasar
behavioral2/files/0x0006000000023204-7.dat	family_quasar
behavioral2/files/0x0006000000023204-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
224	Word.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102

Creates scheduled task(s) 1 TTPs 2 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
2616	schtasks.exe
336	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1984	Client-built.exe
Token: SeDebugPrivilege	224	Word.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
224	Word.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1984 wrote to memory of 2616	1984	Client-built.exe	89
PID 1984 wrote to memory of 2616	1984	Client-built.exe	89
PID 1984 wrote to memory of 224	1984	Client-built.exe	90
PID 1984 wrote to memory of 224	1984	Client-built.exe	90
PID 224 wrote to memory of 336	224	Word.exe	92
PID 224 wrote to memory of 336	224	Word.exe	92

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.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1984
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Word.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:2616
- C:\Users\Admin\AppData\Roaming\SubDir\Word.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Word.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:224
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Word.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:336

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

Word.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Word.exe
Size 153KB
SHA256 3f5b76815fb1ceb2b4c5c773c7409117cda5f796bed1883bf5420a4a92b40198
MD5 959a7a1b524cd155e2f6083c76965637
SHA1 80ba6e7ff3d4d946e7658e92acbcb7c6141c906c
SHA512 d51fcdfdd0e18e311f85fe14f0d678dea0f8919799c23080375641453887de9e6bd7057e024eb84ed87b44f5661ceb68e2a9c8128d710b187abc33363a35664a
SSDEEP 3072:vcFQ52gMzKMeFMnVrwqNueTkz6LNbWHP86y25Qdd:vcvgMzKM4oweTjLNbWHP6l
MD5 SHA1 SHA512 SSDEEP

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Word.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Word.exe
Size 67KB
SHA256 72642d2794b300a3fecb75d779e4bb93b6a68effeec42529cbc320864a1f6082
MD5 85eadebe0607cfb4cd49c816a32f34c6
SHA1 43f8dbf9c494657dbf25d249c590b98820c1b1b6
SHA512 936b99f60bf4d0ace30f41ad50efb70e39e01544d236d7f89411a8950fe8b3503cb599c647f9b0e0639c6348c4559bb4e5e406eff1a351bfcdda7079101530bd
SSDEEP 1536:M3dUXMFQ52gM44KMExpltMnx2Mzi0LM0wqzZvmeT7I0f:vcFQ52gMzKMeFMnVrwqNueTks
MD5 SHA1 SHA512 SSDEEP

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memory/224-9-0x00007FF8BDF40000-0x00007FF8BEA01000-memory.dmp

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memory/224-11-0x000000001B680000-0x000000001B690000-memory.dmp

Download

memory/224-12-0x000000001BF50000-0x000000001BFA0000-memory.dmp

Download

memory/224-13-0x000000001C060000-0x000000001C112000-memory.dmp

Download

memory/224-14-0x00007FF8BDF40000-0x00007FF8BEA01000-memory.dmp

Download

memory/224-15-0x000000001B680000-0x000000001B690000-memory.dmp

Download

memory/1984-0-0x0000000000FC0000-0x00000000012E4000-memory.dmp

Download

memory/1984-1-0x00007FF8BDF40000-0x00007FF8BEA01000-memory.dmp

Download

memory/1984-2-0x000000001C160000-0x000000001C170000-memory.dmp

Download

memory/1984-10-0x00007FF8BDF40000-0x00007FF8BEA01000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads