quasar | 27397e611181aeea033279de2b1ff98d6f3f7a1dd9e72f67bac35d94025d38ab

General

Target

coldstart.exe
Size

3.1MB
MD5

f203168d523e70b35b8d3fc729c22144
SHA1

60232dde8f123dcb45453df4f29baf81fac3353a
SHA256

27397e611181aeea033279de2b1ff98d6f3f7a1dd9e72f67bac35d94025d38ab
SHA512

53c950febedae2a9cf6a64b86b7e3b9abf000641eb7f1c056bebcb8117889671a6569a2650dac4566f26e6ef531df40b23ca15425a5a005dbe30ce13f96e748a
SSDEEP

49152:CvbI22SsaNYfdPBldt698dBcjHbktwOBxgDoGdiSRTHHB72eh2NT:Cvk22SsaNYfdPBldt6+dBcjHSwR

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

10.211.55.25:4782

Mutex

bcdc82e5-0aef-44c0-9c1b-922134e29c07

Attributes

encryption_key
6A71CE09A1F29B83F2F2D2942418EC75697893A6
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/3028-1-0x0000000000FA0000-0x00000000012C4000-memory.dmp	family_quasar
behavioral1/files/0x0036000000016560-5.dat	family_quasar
behavioral1/memory/2688-8-0x00000000012C0000-0x00000000015E4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2688	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
2752	schtasks.exe
2820	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3028	coldstart.exe
Token: SeDebugPrivilege	2688	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2688	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2688	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2688	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 3028 wrote to memory of 2752	3028	coldstart.exe	30
PID 3028 wrote to memory of 2752	3028	coldstart.exe	30
PID 3028 wrote to memory of 2752	3028	coldstart.exe	30
PID 3028 wrote to memory of 2688	3028	coldstart.exe	32
PID 3028 wrote to memory of 2688	3028	coldstart.exe	32
PID 3028 wrote to memory of 2688	3028	coldstart.exe	32
PID 2688 wrote to memory of 2820	2688	Client.exe	33
PID 2688 wrote to memory of 2820	2688	Client.exe	33
PID 2688 wrote to memory of 2820	2688	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\coldstart.exe
"C:\Users\Admin\AppData\Local\Temp\coldstart.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3028
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2752
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.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:2688
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2820

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\Client.exe

Filesize
3.1MB

MD5
f203168d523e70b35b8d3fc729c22144

SHA1
60232dde8f123dcb45453df4f29baf81fac3353a

SHA256
27397e611181aeea033279de2b1ff98d6f3f7a1dd9e72f67bac35d94025d38ab

SHA512
53c950febedae2a9cf6a64b86b7e3b9abf000641eb7f1c056bebcb8117889671a6569a2650dac4566f26e6ef531df40b23ca15425a5a005dbe30ce13f96e748a

Download Submit
memory/2688-9-0x000007FEF4D20000-0x000007FEF570C000-memory.dmp

Filesize
9.9MB

Download
memory/2688-10-0x000007FEF4D20000-0x000007FEF570C000-memory.dmp

Filesize
9.9MB

Download
memory/2688-8-0x00000000012C0000-0x00000000015E4000-memory.dmp

Filesize
3.1MB

Download
memory/2688-11-0x000007FEF4D20000-0x000007FEF570C000-memory.dmp

Filesize
9.9MB

Download
memory/3028-0-0x000007FEF4D23000-0x000007FEF4D24000-memory.dmp

Filesize
4KB

Download
memory/3028-1-0x0000000000FA0000-0x00000000012C4000-memory.dmp

Filesize
3.1MB

Download
memory/3028-2-0x000007FEF4D20000-0x000007FEF570C000-memory.dmp

Filesize
9.9MB

Download
memory/3028-7-0x000007FEF4D20000-0x000007FEF570C000-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