quasar | 457e291dc62946ab2dc1cb558ffca2e90e5ebbd4a27013c5a23930339aedb978

General

Target

87b488fc8f9760bc9182c32ef76be93c.exe
Size

3.1MB
MD5

87b488fc8f9760bc9182c32ef76be93c
SHA1

16c3c1c53963cfedb800515b70e27ca2b7dd79fd
SHA256

457e291dc62946ab2dc1cb558ffca2e90e5ebbd4a27013c5a23930339aedb978
SHA512

30397f8eaf6444502e7e69463463c759711030b0b0ce6812f64f48dee7be6d4ba212045544396ef9e603248bb71a5e4a312eb70a6e7b541161a18301003d089c
SSDEEP

49152:evQI22SsaNYfdPBldt698dBcjHaLA3qarWboGdmhIOTHHB72eh2NT:evt22SsaNYfdPBldt6+dBcjHN3c

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

43.138.147.74:4782

Mutex

4b095ece-017a-46f8-874b-d1266394fa10

Attributes

encryption_key
AB08BB6743A540F991F118F0E7BF74E3D06D95A1
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
behavioral1/memory/2416-1-0x0000000001060000-0x0000000001384000-memory.dmp	family_quasar
behavioral1/files/0x00060000000186f2-4.dat	family_quasar
behavioral1/memory/2944-9-0x0000000000230000-0x0000000000554000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2944	Client.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\Client.exe	87b488fc8f9760bc9182c32ef76be93c.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	87b488fc8f9760bc9182c32ef76be93c.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
2892	schtasks.exe
2984	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2416	87b488fc8f9760bc9182c32ef76be93c.exe
Token: SeDebugPrivilege	2944	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2944	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2416 wrote to memory of 2892	2416	87b488fc8f9760bc9182c32ef76be93c.exe	31
PID 2416 wrote to memory of 2892	2416	87b488fc8f9760bc9182c32ef76be93c.exe	31
PID 2416 wrote to memory of 2892	2416	87b488fc8f9760bc9182c32ef76be93c.exe	31
PID 2416 wrote to memory of 2944	2416	87b488fc8f9760bc9182c32ef76be93c.exe	33
PID 2416 wrote to memory of 2944	2416	87b488fc8f9760bc9182c32ef76be93c.exe	33
PID 2416 wrote to memory of 2944	2416	87b488fc8f9760bc9182c32ef76be93c.exe	33
PID 2944 wrote to memory of 2984	2944	Client.exe	34
PID 2944 wrote to memory of 2984	2944	Client.exe	34
PID 2944 wrote to memory of 2984	2944	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\87b488fc8f9760bc9182c32ef76be93c.exe
"C:\Users\Admin\AppData\Local\Temp\87b488fc8f9760bc9182c32ef76be93c.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2416
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2892
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2944
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2984

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:\Windows\System32\SubDir\Client.exe

Filesize
3.1MB

MD5
87b488fc8f9760bc9182c32ef76be93c

SHA1
16c3c1c53963cfedb800515b70e27ca2b7dd79fd

SHA256
457e291dc62946ab2dc1cb558ffca2e90e5ebbd4a27013c5a23930339aedb978

SHA512
30397f8eaf6444502e7e69463463c759711030b0b0ce6812f64f48dee7be6d4ba212045544396ef9e603248bb71a5e4a312eb70a6e7b541161a18301003d089c

Download Submit
memory/2416-0-0x000007FEF5F93000-0x000007FEF5F94000-memory.dmp

Filesize
4KB

Download
memory/2416-1-0x0000000001060000-0x0000000001384000-memory.dmp

Filesize
3.1MB

Download
memory/2416-2-0x000007FEF5F90000-0x000007FEF697C000-memory.dmp

Filesize
9.9MB

Download
memory/2416-8-0x000007FEF5F90000-0x000007FEF697C000-memory.dmp

Filesize
9.9MB

Download
memory/2944-7-0x000007FEF5F90000-0x000007FEF697C000-memory.dmp

Filesize
9.9MB

Download
memory/2944-9-0x0000000000230000-0x0000000000554000-memory.dmp

Filesize
3.1MB

Download
memory/2944-10-0x000007FEF5F90000-0x000007FEF697C000-memory.dmp

Filesize
9.9MB

Download
memory/2944-11-0x000007FEF5F90000-0x000007FEF697C000-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