quasar | 0463f6a7f96dd95ae2352e658a17210f6242fec676cacd4c9a8042e1b040560e

General

Target

Client-built.exe
Size

3.1MB
MD5

d736427dd2ccd3f8a536d5cf69827f6f
SHA1

20db2442845c8559801de82434b3af89b6545c4a
SHA256

0463f6a7f96dd95ae2352e658a17210f6242fec676cacd4c9a8042e1b040560e
SHA512

822bdf46a2f950f42a8c17afe9cf1ca27685fb44e180966871df2f2da08b872a10e72e5c892b901d3c1a9f2421ed91ac14b452d0d87fff8146e3839740fb0112
SSDEEP

49152:fvvlL26AaNeWgPhlmVqvMQ7XSKPmEqf5P+rk/GLoGABTHHB72eh2NT:fv9L26AaNeWgPhlmVqkQ7XSKZqU

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

Name1442-37611.portmap.host:37611

Mutex

f21583dc-cd85-4a94-b7ea-858f2e9d6287

Attributes

encryption_key
A43011D93D39774DA187A9FA7731DE56F484D345
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/2744-1-0x0000000001060000-0x0000000001384000-memory.dmp	family_quasar
behavioral1/files/0x0008000000015cfd-6.dat	family_quasar
behavioral1/memory/2820-10-0x00000000000A0000-0x00000000003C4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2820	Client.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client.exe
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

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
2700	schtasks.exe
1632	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2744	Client-built.exe
Token: SeDebugPrivilege	2820	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2820	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2820	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2820	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2744 wrote to memory of 2700	2744	Client-built.exe	31
PID 2744 wrote to memory of 2700	2744	Client-built.exe	31
PID 2744 wrote to memory of 2700	2744	Client-built.exe	31
PID 2744 wrote to memory of 2820	2744	Client-built.exe	33
PID 2744 wrote to memory of 2820	2744	Client-built.exe	33
PID 2744 wrote to memory of 2820	2744	Client-built.exe	33
PID 2820 wrote to memory of 1632	2820	Client.exe	34
PID 2820 wrote to memory of 1632	2820	Client.exe	34
PID 2820 wrote to memory of 1632	2820	Client.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:2744
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2700
- 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:2820
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1632

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
d736427dd2ccd3f8a536d5cf69827f6f

SHA1
20db2442845c8559801de82434b3af89b6545c4a

SHA256
0463f6a7f96dd95ae2352e658a17210f6242fec676cacd4c9a8042e1b040560e

SHA512
822bdf46a2f950f42a8c17afe9cf1ca27685fb44e180966871df2f2da08b872a10e72e5c892b901d3c1a9f2421ed91ac14b452d0d87fff8146e3839740fb0112

Download Submit
memory/2744-0-0x000007FEF61F3000-0x000007FEF61F4000-memory.dmp

Filesize
4KB

Download
memory/2744-1-0x0000000001060000-0x0000000001384000-memory.dmp

Filesize
3.1MB

Download
memory/2744-2-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

Filesize
9.9MB

Download
memory/2744-8-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

Filesize
9.9MB

Download
memory/2820-10-0x00000000000A0000-0x00000000003C4000-memory.dmp

Filesize
3.1MB

Download
memory/2820-9-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

Filesize
9.9MB

Download
memory/2820-11-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

Filesize
9.9MB

Download
memory/2820-12-0x000007FEF61F0000-0x000007FEF6BDC000-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