quasar | 78fe9f9cac3e4d5cf653be4475c8f247d4803379365dd44320716ea7384a8c11

General

Target

78fe9f9cac3e4d5cf653be4475c8f247d4803379365dd44320716ea7384a8c11.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 2 IoCs

resource	yara_rule
behavioral2/memory/4272-1-0x0000000000A10000-0x0000000000D34000-memory.dmp	family_quasar
behavioral2/files/0x0032000000023b75-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4840	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
4432	schtasks.exe
392	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4272	78fe9f9cac3e4d5cf653be4475c8f247d4803379365dd44320716ea7384a8c11.exe
Token: SeDebugPrivilege	4840	SYSTEM26.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4840	SYSTEM26.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4840	SYSTEM26.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4840	SYSTEM26.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4272 wrote to memory of 4432	4272	78fe9f9cac3e4d5cf653be4475c8f247d4803379365dd44320716ea7384a8c11.exe	83
PID 4272 wrote to memory of 4432	4272	78fe9f9cac3e4d5cf653be4475c8f247d4803379365dd44320716ea7384a8c11.exe	83
PID 4272 wrote to memory of 4840	4272	78fe9f9cac3e4d5cf653be4475c8f247d4803379365dd44320716ea7384a8c11.exe	85
PID 4272 wrote to memory of 4840	4272	78fe9f9cac3e4d5cf653be4475c8f247d4803379365dd44320716ea7384a8c11.exe	85
PID 4840 wrote to memory of 392	4840	SYSTEM26.exe	86
PID 4840 wrote to memory of 392	4840	SYSTEM26.exe	86

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\78fe9f9cac3e4d5cf653be4475c8f247d4803379365dd44320716ea7384a8c11.exe
"C:\Users\Admin\AppData\Local\Temp\78fe9f9cac3e4d5cf653be4475c8f247d4803379365dd44320716ea7384a8c11.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4272
- 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:4432
- 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:4840
- - 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:392

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/4272-0-0x00007FFE00F33000-0x00007FFE00F35000-memory.dmp

Filesize
8KB

Download
memory/4272-1-0x0000000000A10000-0x0000000000D34000-memory.dmp

Filesize
3.1MB

Download
memory/4272-2-0x00007FFE00F30000-0x00007FFE019F1000-memory.dmp

Filesize
10.8MB

Download
memory/4272-9-0x00007FFE00F30000-0x00007FFE019F1000-memory.dmp

Filesize
10.8MB

Download
memory/4840-10-0x00007FFE00F30000-0x00007FFE019F1000-memory.dmp

Filesize
10.8MB

Download
memory/4840-11-0x00007FFE00F30000-0x00007FFE019F1000-memory.dmp

Filesize
10.8MB

Download
memory/4840-12-0x000000001CA60000-0x000000001CAB0000-memory.dmp

Filesize
320KB

Download
memory/4840-13-0x000000001CB70000-0x000000001CC22000-memory.dmp

Filesize
712KB

Download
memory/4840-14-0x00007FFE00F30000-0x00007FFE019F1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads