quasar | 78fe9f9cac3e4d5cf653be4475c8f247d4803379365dd44320716ea7384a8c11

General

Target

Client-built.exe
Size

3.1MB
MD5

be5735282826036dcacc522c081365a0
SHA1

310bba5786ba8a4087cb8045ea699279a434a818
SHA256

78fe9f9cac3e4d5cf653be4475c8f247d4803379365dd44320716ea7384a8c11
SHA512

0fecccb5dd1ecfc0eba3dc89e078b2210ea6299d0f60cdd7bade885872cd07f6bbf041b98924054b71d35d94e56e3004ac825c5f2f9feb7f18758fad25c3b2f3
SSDEEP

49152:eviI22SsaNYfdPBldt698dBcjHq1SQoGv5lpTHHB72eh2NT:evv22SsaNYfdPBldt6+dBcjHq19x

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

193.161.193.99:43242

Mutex

45bfb701-bea2-411a-948d-9a6abe001f83

Attributes

encryption_key
80594967BC0A4839C316A44D62DE36E9BF18177F
install_name
SYSTEM26.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/2856-1-0x0000000000840000-0x0000000000B64000-memory.dmp	family_quasar
behavioral1/files/0x000b000000016d36-6.dat	family_quasar
behavioral1/memory/2832-10-0x0000000000020000-0x0000000000344000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2832	SYSTEM26.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
2668	schtasks.exe
2312	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2856	Client-built.exe
Token: SeDebugPrivilege	2832	SYSTEM26.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2832	SYSTEM26.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2832	SYSTEM26.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2832	SYSTEM26.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2856 wrote to memory of 2668	2856	Client-built.exe	30
PID 2856 wrote to memory of 2668	2856	Client-built.exe	30
PID 2856 wrote to memory of 2668	2856	Client-built.exe	30
PID 2856 wrote to memory of 2832	2856	Client-built.exe	32
PID 2856 wrote to memory of 2832	2856	Client-built.exe	32
PID 2856 wrote to memory of 2832	2856	Client-built.exe	32
PID 2832 wrote to memory of 2312	2832	SYSTEM26.exe	33
PID 2832 wrote to memory of 2312	2832	SYSTEM26.exe	33
PID 2832 wrote to memory of 2312	2832	SYSTEM26.exe	33

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:2856
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\SYSTEM26.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2668
- C:\Users\Admin\AppData\Roaming\SubDir\SYSTEM26.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\SYSTEM26.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:2832
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\SYSTEM26.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2312

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\SYSTEM26.exe

Filesize
3.1MB

MD5
be5735282826036dcacc522c081365a0

SHA1
310bba5786ba8a4087cb8045ea699279a434a818

SHA256
78fe9f9cac3e4d5cf653be4475c8f247d4803379365dd44320716ea7384a8c11

SHA512
0fecccb5dd1ecfc0eba3dc89e078b2210ea6299d0f60cdd7bade885872cd07f6bbf041b98924054b71d35d94e56e3004ac825c5f2f9feb7f18758fad25c3b2f3

Download Submit
memory/2832-9-0x000007FEF6470000-0x000007FEF6E5C000-memory.dmp

Filesize
9.9MB

Download
memory/2832-11-0x000007FEF6470000-0x000007FEF6E5C000-memory.dmp

Filesize
9.9MB

Download
memory/2832-10-0x0000000000020000-0x0000000000344000-memory.dmp

Filesize
3.1MB

Download
memory/2832-12-0x000007FEF6470000-0x000007FEF6E5C000-memory.dmp

Filesize
9.9MB

Download
memory/2856-0-0x000007FEF6473000-0x000007FEF6474000-memory.dmp

Filesize
4KB

Download
memory/2856-1-0x0000000000840000-0x0000000000B64000-memory.dmp

Filesize
3.1MB

Download
memory/2856-2-0x000007FEF6470000-0x000007FEF6E5C000-memory.dmp

Filesize
9.9MB

Download
memory/2856-8-0x000007FEF6470000-0x000007FEF6E5C000-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