quasar | a45b373b780f5b9fcf5c51473c69bbf0ed650f300523097602b35f5222bd122b

General

Target

cclent.exe
Size

3.1MB
MD5

94222631ef1071a4f7ceb180cf8a4a5a
SHA1

786d8b2d8b931a9282ee54367d2dda501f1ca946
SHA256

a45b373b780f5b9fcf5c51473c69bbf0ed650f300523097602b35f5222bd122b
SHA512

00503983a35e8d0f65eea6a811d7177a389cb1b4d8716d32e50fd5346deb428cd472cbaca7375c56ac3f113ea76db55322993b4d68d816b50a4b27887a2fa14d
SSDEEP

49152:ivht62XlaSFNWPjljiFa2RoUYIo7RJ6SbR3LoGd+vTHHB72eh2NT:ivL62XlaSFNWPjljiFXRoUYIo7RJ6M

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

91.92.243.191:5401

Mutex

fce41024-0e2f-475b-929b-e58a126341bd

Attributes

encryption_key
802CAE367B042C840DD4E29539BB1BFEC16FB48A
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
vchost32
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
behavioral1/memory/2360-1-0x0000000001350000-0x0000000001674000-memory.dmp	family_quasar
behavioral1/files/0x00060000000186f2-6.dat	family_quasar
behavioral1/memory/1160-8-0x0000000000AB0000-0x0000000000DD4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1160	Client.exe

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

System Information Discovery
T1082

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
2320	schtasks.exe
2676	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2360	cclent.exe
Token: SeDebugPrivilege	1160	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1160	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
1160	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1160	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2360 wrote to memory of 2320	2360	cclent.exe	32
PID 2360 wrote to memory of 2320	2360	cclent.exe	32
PID 2360 wrote to memory of 2320	2360	cclent.exe	32
PID 2360 wrote to memory of 1160	2360	cclent.exe	34
PID 2360 wrote to memory of 1160	2360	cclent.exe	34
PID 2360 wrote to memory of 1160	2360	cclent.exe	34
PID 1160 wrote to memory of 2676	1160	Client.exe	35
PID 1160 wrote to memory of 2676	1160	Client.exe	35
PID 1160 wrote to memory of 2676	1160	Client.exe	35

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\cclent.exe
"C:\Users\Admin\AppData\Local\Temp\cclent.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2360
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "vchost32" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2320
- 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
  - Suspicious use of WriteProcessMemory
  PID:1160
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "vchost32" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2676

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

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
3.1MB

MD5
94222631ef1071a4f7ceb180cf8a4a5a

SHA1
786d8b2d8b931a9282ee54367d2dda501f1ca946

SHA256
a45b373b780f5b9fcf5c51473c69bbf0ed650f300523097602b35f5222bd122b

SHA512
00503983a35e8d0f65eea6a811d7177a389cb1b4d8716d32e50fd5346deb428cd472cbaca7375c56ac3f113ea76db55322993b4d68d816b50a4b27887a2fa14d

Download Submit
memory/1160-8-0x0000000000AB0000-0x0000000000DD4000-memory.dmp

Filesize
3.1MB

Download
memory/1160-10-0x000007FEF5800000-0x000007FEF61EC000-memory.dmp

Filesize
9.9MB

Download
memory/1160-11-0x000007FEF5800000-0x000007FEF61EC000-memory.dmp

Filesize
9.9MB

Download
memory/1160-12-0x000007FEF5800000-0x000007FEF61EC000-memory.dmp

Filesize
9.9MB

Download
memory/2360-0-0x000007FEF5803000-0x000007FEF5804000-memory.dmp

Filesize
4KB

Download
memory/2360-1-0x0000000001350000-0x0000000001674000-memory.dmp

Filesize
3.1MB

Download
memory/2360-2-0x000007FEF5800000-0x000007FEF61EC000-memory.dmp

Filesize
9.9MB

Download
memory/2360-9-0x000007FEF5800000-0x000007FEF61EC000-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