quasar | 7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1

General

Target

Client-built.exe
Size

3.1MB
MD5

11563580013b8994395ff739dc37ed4a
SHA1

c527a22166dc153687ca33a8d964687459a6b669
SHA256

7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1
SHA512

4047470a756067ca4a4a038c080039945f37220fba7554ecad5d4912d4ea8611bd5efa5f72bbc7084ecfdbee3d63e8a163b675639572e2b9f21253f4c6e93e59
SSDEEP

49152:6vRt62XlaSFNWPjljiFa2RoUYIfu83oGNZZpTHHB72eh2NT:6vb62XlaSFNWPjljiFXRoUYIfuC

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.70:4782

Mutex

4cacefbd-58c1-418c-9da0-e646e1e6fc72

Attributes

encryption_key
772212B3F3C08D6945CE72024D790AD46DD8341D
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
defender
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/2836-1-0x0000000001290000-0x00000000015B4000-memory.dmp	family_quasar
behavioral1/files/0x00370000000160db-6.dat	family_quasar
behavioral1/memory/2244-8-0x00000000009D0000-0x0000000000CF4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2244	Client.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\SubDir	Client.exe
File created	C:\Windows\system32\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	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
2832	schtasks.exe
2704	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2836	Client-built.exe
Token: SeDebugPrivilege	2244	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2244	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2244	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2244	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2836 wrote to memory of 2832	2836	Client-built.exe	30
PID 2836 wrote to memory of 2832	2836	Client-built.exe	30
PID 2836 wrote to memory of 2832	2836	Client-built.exe	30
PID 2836 wrote to memory of 2244	2836	Client-built.exe	32
PID 2836 wrote to memory of 2244	2836	Client-built.exe	32
PID 2836 wrote to memory of 2244	2836	Client-built.exe	32
PID 2244 wrote to memory of 2704	2244	Client.exe	33
PID 2244 wrote to memory of 2704	2244	Client.exe	33
PID 2244 wrote to memory of 2704	2244	Client.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⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2836
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "defender" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2832
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2244
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "defender" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2704

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:\Windows\System32\SubDir\Client.exe

Filesize
3.1MB

MD5
11563580013b8994395ff739dc37ed4a

SHA1
c527a22166dc153687ca33a8d964687459a6b669

SHA256
7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1

SHA512
4047470a756067ca4a4a038c080039945f37220fba7554ecad5d4912d4ea8611bd5efa5f72bbc7084ecfdbee3d63e8a163b675639572e2b9f21253f4c6e93e59

Download Submit
memory/2244-11-0x000007FEF5E30000-0x000007FEF681C000-memory.dmp

Filesize
9.9MB

Download
memory/2244-9-0x000007FEF5E30000-0x000007FEF681C000-memory.dmp

Filesize
9.9MB

Download
memory/2244-8-0x00000000009D0000-0x0000000000CF4000-memory.dmp

Filesize
3.1MB

Download
memory/2244-12-0x000007FEF5E30000-0x000007FEF681C000-memory.dmp

Filesize
9.9MB

Download
memory/2836-0-0x000007FEF5E33000-0x000007FEF5E34000-memory.dmp

Filesize
4KB

Download
memory/2836-1-0x0000000001290000-0x00000000015B4000-memory.dmp

Filesize
3.1MB

Download
memory/2836-2-0x000007FEF5E30000-0x000007FEF681C000-memory.dmp

Filesize
9.9MB

Download
memory/2836-10-0x000007FEF5E30000-0x000007FEF681C000-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