quasar | b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8

General

Target

b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8.exe
Size

3.1MB
MD5

77de6e8143094a619804ebf2d59eb094
SHA1

b87fc79d0825d979314c392781b0211087e78ca2
SHA256

b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8
SHA512

fa6dcd1d8b78548e12d22098a6b9107a744b9b85dd8276c18faf601f30ada97e7f023c6e376dc929c715c308a57b1105199acdd69697a0e6930bccd7afc2a6f9
SSDEEP

49152:zvylL26AaNeWgPhlmVqvMQ7XSKokCP1JSLoGdatCTHHB72eh2NT:zvqL26AaNeWgPhlmVqkQ7XSKokCs

Score

10^/10

quasar test spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Test

C2

193.161.193.99:35184

67.205.154.243:35184

Mutex

9cabbafb-503b-49f1-ab22-adc756455c10

Attributes

encryption_key
8B93C77AC1C58EA80A3327E9FD26246A79EF3B8E
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
MS Build Tools
subdirectory
Microsoft-Build-Tools

Signatures

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral1/memory/2292-1-0x0000000000D20000-0x0000000001044000-memory.dmp	family_quasar
behavioral1/files/0x000800000001941b-5.dat	family_quasar
behavioral1/memory/1940-7-0x0000000000950000-0x0000000000C74000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1940	Client.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
484	schtasks.exe
2752	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2292	b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8.exe
Token: SeDebugPrivilege	1940	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1940	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2292 wrote to memory of 484	2292	b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8.exe	31
PID 2292 wrote to memory of 484	2292	b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8.exe	31
PID 2292 wrote to memory of 484	2292	b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8.exe	31
PID 2292 wrote to memory of 1940	2292	b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8.exe	33
PID 2292 wrote to memory of 1940	2292	b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8.exe	33
PID 2292 wrote to memory of 1940	2292	b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8.exe	33
PID 1940 wrote to memory of 2752	1940	Client.exe	34
PID 1940 wrote to memory of 2752	1940	Client.exe	34
PID 1940 wrote to memory of 2752	1940	Client.exe	34

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\b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8.exe
"C:\Users\Admin\AppData\Local\Temp\b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2292
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "MS Build Tools" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Microsoft-Build-Tools\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:484
- C:\Users\Admin\AppData\Roaming\Microsoft-Build-Tools\Client.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft-Build-Tools\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1940
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "MS Build Tools" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Microsoft-Build-Tools\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2752

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft-Build-Tools\Client.exe

Filesize
3.1MB

MD5
77de6e8143094a619804ebf2d59eb094

SHA1
b87fc79d0825d979314c392781b0211087e78ca2

SHA256
b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8

SHA512
fa6dcd1d8b78548e12d22098a6b9107a744b9b85dd8276c18faf601f30ada97e7f023c6e376dc929c715c308a57b1105199acdd69697a0e6930bccd7afc2a6f9

Download Submit
memory/1940-9-0x000007FEF5B10000-0x000007FEF64FC000-memory.dmp

Filesize
9.9MB

Download
memory/1940-10-0x000007FEF5B10000-0x000007FEF64FC000-memory.dmp

Filesize
9.9MB

Download
memory/1940-7-0x0000000000950000-0x0000000000C74000-memory.dmp

Filesize
3.1MB

Download
memory/1940-11-0x000007FEF5B10000-0x000007FEF64FC000-memory.dmp

Filesize
9.9MB

Download
memory/2292-0-0x000007FEF5B13000-0x000007FEF5B14000-memory.dmp

Filesize
4KB

Download
memory/2292-1-0x0000000000D20000-0x0000000001044000-memory.dmp

Filesize
3.1MB

Download
memory/2292-2-0x000007FEF5B10000-0x000007FEF64FC000-memory.dmp

Filesize
9.9MB

Download
memory/2292-8-0x000007FEF5B10000-0x000007FEF64FC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads