quasar | 83fd2015a5499a8c2703d91aa047d0f099b85e8aa5ef9f2643a4eda4144a8772

Analysis

max time kernel
126s
max time network
142s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
11/03/2025, 07:59

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General

Target

7f8bcaf3c125b12f6b8cc4cd98bfe089b433753bed821414b1fcf6b958b1935d.exe
Size

3.1MB
MD5

b4cd9c13456ab1f1a898dfad9c41e2c7
SHA1

57a07384227d70739d2bbaad50ab7fa0dde6aa99
SHA256

7f8bcaf3c125b12f6b8cc4cd98bfe089b433753bed821414b1fcf6b958b1935d
SHA512

d8934a132f11cbab2c7f7006f52c627d19b0ad93d3621271041647f5af71028444d3199dcf08c2e9e32097662bb4871361ffeddcd62b036f44f51d4cc01d21a8
SSDEEP

49152:bv+I22SsaNYfdPBldt698dBcjH9j2V1JqLoGdm3THHB72eh2NT:bvz22SsaNYfdPBldt6+dBcjH9j22W

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

29.108.204.55:4782

Mutex

25a40824-af89-44c7-904a-02df809f23ff

Attributes

encryption_key
C048AC4A4021B85F60313CB2B2CD1D086A994110
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral23/memory/2384-1-0x0000000001090000-0x00000000013B4000-memory.dmp	family_quasar
behavioral23/files/0x000500000001c894-6.dat	family_quasar
behavioral23/memory/2388-10-0x0000000001260000-0x0000000001584000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2388	Client.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2384	7f8bcaf3c125b12f6b8cc4cd98bfe089b433753bed821414b1fcf6b958b1935d.exe
Token: SeDebugPrivilege	2388	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2388	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2388	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2388	Client.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2384 wrote to memory of 2388	2384	7f8bcaf3c125b12f6b8cc4cd98bfe089b433753bed821414b1fcf6b958b1935d.exe	30
PID 2384 wrote to memory of 2388	2384	7f8bcaf3c125b12f6b8cc4cd98bfe089b433753bed821414b1fcf6b958b1935d.exe	30
PID 2384 wrote to memory of 2388	2384	7f8bcaf3c125b12f6b8cc4cd98bfe089b433753bed821414b1fcf6b958b1935d.exe	30

C:\Users\Admin\AppData\Local\Temp\7f8bcaf3c125b12f6b8cc4cd98bfe089b433753bed821414b1fcf6b958b1935d.exe
"C:\Users\Admin\AppData\Local\Temp\7f8bcaf3c125b12f6b8cc4cd98bfe089b433753bed821414b1fcf6b958b1935d.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2384
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  PID:2388

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
b4cd9c13456ab1f1a898dfad9c41e2c7

SHA1
57a07384227d70739d2bbaad50ab7fa0dde6aa99

SHA256
7f8bcaf3c125b12f6b8cc4cd98bfe089b433753bed821414b1fcf6b958b1935d

SHA512
d8934a132f11cbab2c7f7006f52c627d19b0ad93d3621271041647f5af71028444d3199dcf08c2e9e32097662bb4871361ffeddcd62b036f44f51d4cc01d21a8

Download Submit
memory/2384-0-0x000007FEF67C3000-0x000007FEF67C4000-memory.dmp

Filesize
4KB

Download
memory/2384-1-0x0000000001090000-0x00000000013B4000-memory.dmp

Filesize
3.1MB

Download
memory/2384-2-0x000007FEF67C0000-0x000007FEF71AC000-memory.dmp

Filesize
9.9MB

Download
memory/2384-9-0x000007FEF67C0000-0x000007FEF71AC000-memory.dmp

Filesize
9.9MB

Download
memory/2388-8-0x000007FEF67C0000-0x000007FEF71AC000-memory.dmp

Filesize
9.9MB

Download
memory/2388-10-0x0000000001260000-0x0000000001584000-memory.dmp

Filesize
3.1MB

Download
memory/2388-11-0x000007FEF67C0000-0x000007FEF71AC000-memory.dmp

Filesize
9.9MB

Download
memory/2388-12-0x000007FEF67C0000-0x000007FEF71AC000-memory.dmp

Filesize
9.9MB

Download