quasar | e5963a8de3d81aff5bd3193d5137baa1b9022d6106dc3141f4d99c14e2fbad7e

General

Target

Client-built.exe
Size

3.1MB
MD5

c17ff0333852bb47c256d3a448910271
SHA1

be09b580de7608f2f1e9013bd16ad5499faf2ce3
SHA256

e5963a8de3d81aff5bd3193d5137baa1b9022d6106dc3141f4d99c14e2fbad7e
SHA512

1bf1840de9a7547fef877e0986c4a71c0360ea9005a3f85b98836596acc713e6d9764fd9c0a0d7356b0621cb278ec403bf7ac71f8155decb046d14ec4ecd13f5
SSDEEP

49152:rvClL26AaNeWgPhlmVqvMQ7XSK7pDGjHmzMVoGdBHTHHB72eh2NT:rv6L26AaNeWgPhlmVqkQ7XSKdDGjN

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

answer-patients.gl.at.ply.gg:4538

Mutex

bd9cc66c-344e-4ad2-b846-b59ac86aa18e

Attributes

encryption_key
9672EF6F385B517A0E912363D30D7BF6BDEA77A6
install_name
siema.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
svhost.gg

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/1628-1-0x00000000011C0000-0x00000000014E4000-memory.dmp	family_quasar
behavioral1/files/0x00080000000173b2-5.dat	family_quasar
behavioral1/memory/2644-7-0x00000000003B0000-0x00000000006D4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2644	siema.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system32\svhost.gg\siema.exe	Client-built.exe
File opened for modification	C:\Windows\system32\svhost.gg\siema.exe	Client-built.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
848	schtasks.exe
2480	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1628	Client-built.exe
Token: SeDebugPrivilege	2644	siema.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2644	siema.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2644	siema.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2644	siema.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1628 wrote to memory of 2480	1628	Client-built.exe	31
PID 1628 wrote to memory of 2480	1628	Client-built.exe	31
PID 1628 wrote to memory of 2480	1628	Client-built.exe	31
PID 1628 wrote to memory of 2644	1628	Client-built.exe	33
PID 1628 wrote to memory of 2644	1628	Client-built.exe	33
PID 1628 wrote to memory of 2644	1628	Client-built.exe	33
PID 2644 wrote to memory of 848	2644	siema.exe	34
PID 2644 wrote to memory of 848	2644	siema.exe	34
PID 2644 wrote to memory of 848	2644	siema.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\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:1628
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\svhost.gg\siema.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2480
- C:\Windows\system32\svhost.gg\siema.exe
  "C:\Windows\system32\svhost.gg\siema.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:2644
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\svhost.gg\siema.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:848

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\svhost.gg\siema.exe

Filesize
3.1MB

MD5
c17ff0333852bb47c256d3a448910271

SHA1
be09b580de7608f2f1e9013bd16ad5499faf2ce3

SHA256
e5963a8de3d81aff5bd3193d5137baa1b9022d6106dc3141f4d99c14e2fbad7e

SHA512
1bf1840de9a7547fef877e0986c4a71c0360ea9005a3f85b98836596acc713e6d9764fd9c0a0d7356b0621cb278ec403bf7ac71f8155decb046d14ec4ecd13f5

Download Submit
memory/1628-0-0x000007FEF5B73000-0x000007FEF5B74000-memory.dmp

Filesize
4KB

Download
memory/1628-1-0x00000000011C0000-0x00000000014E4000-memory.dmp

Filesize
3.1MB

Download
memory/1628-2-0x000007FEF5B70000-0x000007FEF655C000-memory.dmp

Filesize
9.9MB

Download
memory/1628-8-0x000007FEF5B70000-0x000007FEF655C000-memory.dmp

Filesize
9.9MB

Download
memory/2644-7-0x00000000003B0000-0x00000000006D4000-memory.dmp

Filesize
3.1MB

Download
memory/2644-9-0x000007FEF5B70000-0x000007FEF655C000-memory.dmp

Filesize
9.9MB

Download
memory/2644-10-0x000007FEF5B70000-0x000007FEF655C000-memory.dmp

Filesize
9.9MB

Download
memory/2644-11-0x000007FEF5B70000-0x000007FEF655C000-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