quasar | b2a5bbacabfa8f6cd6c24f87a5825a8231cce32086d369be612c6b7bdf658dad | Triage™

Analysis

max time kernel
1789s
max time network
1799s
platform
windows7_x64
resource
win7-20231129-en
resource tags

arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
submitted
28/05/2024, 21:07

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General

Target
Client-built.exe
Size 3.1MB
Sample240528-zyacmade45
SHA256 b2a5bbacabfa8f6cd6c24f87a5825a8231cce32086d369be612c6b7bdf658dad
MD5 fd874e0d6811bcbd5feb812040853642
SHA1 7213c686b0e8cbb6527077eaeb3291791a8f06ba
SHA512 3c8265e9d981b0d5ebbd1157b79afb3b31f57f6083f2c5ce6d4658718b5d79faf4358936af76aa4a4e1e94f7803ef6c77e07e782333d9d7003d42ea1de2ffa34
SSDEEP 49152:bvxI22SsaNYfdPBldt698dBcjHLYqQJmzaloGdbhTHHB72eh2NT:bvi22SsaNYfdPBldt6+dBcjHkqQ3
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar seroxen spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

SeroXen

C2

operations-wagner.gl.at.ply.gg:50199

Mutex

164b6496-cf32-4fdd-b70d-de29665c8286

Attributes

encryption_key
A88D7FED7F655EBDC4F99C21BAE5EC62300AADC7
install_name
$sxr-insta.exe
log_directory
$sxr-logs
reconnect_delay
1000
startup_key
$sxr-mstha
subdirectory
$sxr-start

Signatures

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral2/memory/836-1-0x0000000000AB0000-0x0000000000DD4000-memory.dmp	family_quasar
behavioral2/files/0x000900000001447e-6.dat	family_quasar
behavioral2/memory/2544-10-0x0000000000E90000-0x00000000011B4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2544	$sxr-insta.exe

Creates scheduled task(s) 1 TTPs 2 IoCs

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

Scheduled Task/Job

pid	Process
2808	schtasks.exe
2564	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	836	Client-built.exe
Token: SeDebugPrivilege	2544	$sxr-insta.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2544	$sxr-insta.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 836 wrote to memory of 2808	836	Client-built.exe	28
PID 836 wrote to memory of 2808	836	Client-built.exe	28
PID 836 wrote to memory of 2808	836	Client-built.exe	28
PID 836 wrote to memory of 2544	836	Client-built.exe	30
PID 836 wrote to memory of 2544	836	Client-built.exe	30
PID 836 wrote to memory of 2544	836	Client-built.exe	30
PID 2544 wrote to memory of 2564	2544	$sxr-insta.exe	31
PID 2544 wrote to memory of 2564	2544	$sxr-insta.exe	31
PID 2544 wrote to memory of 2564	2544	$sxr-insta.exe	31

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:836
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "$sxr-mstha" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\$sxr-start\$sxr-insta.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:2808
- C:\Users\Admin\AppData\Roaming\$sxr-start\$sxr-insta.exe
  "C:\Users\Admin\AppData\Roaming\$sxr-start\$sxr-insta.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2544
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "$sxr-mstha" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\$sxr-start\$sxr-insta.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2564

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Persistence

Scheduled Task/Job

Privilege Escalation

Scheduled Task/Job

Defense Evasion

Credential Access

Discovery

Query Registry

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

$sxr-insta.exe

Path C:\Users\Admin\AppData\Roaming\$sxr-start\$sxr-insta.exe
Size 3.1MB
SHA256 b2a5bbacabfa8f6cd6c24f87a5825a8231cce32086d369be612c6b7bdf658dad
MD5 fd874e0d6811bcbd5feb812040853642
SHA1 7213c686b0e8cbb6527077eaeb3291791a8f06ba
SHA512 3c8265e9d981b0d5ebbd1157b79afb3b31f57f6083f2c5ce6d4658718b5d79faf4358936af76aa4a4e1e94f7803ef6c77e07e782333d9d7003d42ea1de2ffa34
SSDEEP 49152:bvxI22SsaNYfdPBldt698dBcjHLYqQJmzaloGdbhTHHB72eh2NT:bvi22SsaNYfdPBldt6+dBcjHkqQ3
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/836-0-0x000007FEF5823000-0x000007FEF5824000-memory.dmp

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memory/836-1-0x0000000000AB0000-0x0000000000DD4000-memory.dmp

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memory/836-2-0x000007FEF5820000-0x000007FEF620C000-memory.dmp

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memory/836-9-0x000007FEF5820000-0x000007FEF620C000-memory.dmp

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memory/2544-8-0x000007FEF5820000-0x000007FEF620C000-memory.dmp

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memory/2544-10-0x0000000000E90000-0x00000000011B4000-memory.dmp

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memory/2544-11-0x000007FEF5820000-0x000007FEF620C000-memory.dmp

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memory/2544-12-0x000007FEF5820000-0x000007FEF620C000-memory.dmp

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