quasar | 5df3470db00597e3da516459648dfa6a2c1564a57c1d51817d952beeeb860a2c

General

Target

5df3470db00597e3da516459648dfa6a2c1564a57c1d51817d952beeeb860a2c.exe
Size

3.1MB
MD5

1c1a86dad78326429577ab0b7b7b5858
SHA1

cf9aeb9a02d368918d89fc69d55b38829ab83039
SHA256

5df3470db00597e3da516459648dfa6a2c1564a57c1d51817d952beeeb860a2c
SHA512

db9658604a62090fd69cbb7504bf320c947473dfdb10be9e7e866af0a47db228755c1ff8e740eacbe20481df71bc5527347c4185e831515b30ab91b07e46b204
SSDEEP

49152:SvnI22SsaNYfdPBldt698dBcjH9pg1JbLoGdwnTHHB72eh2NT:SvI22SsaNYfdPBldt6+dBcjH9p4

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.101:4782

Mutex

20f2b2b5-8392-4fbe-9585-0778c516b863

Attributes

encryption_key
3A9499E06EC8E749CF7AE8F7D466BD97D9B2380C
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 2 IoCs

resource	yara_rule
behavioral2/memory/2336-1-0x00000000008B0000-0x0000000000BD4000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b8e-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2604	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
3968	schtasks.exe
1400	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2336	5df3470db00597e3da516459648dfa6a2c1564a57c1d51817d952beeeb860a2c.exe
Token: SeDebugPrivilege	2604	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2604	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2604	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2604	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2336 wrote to memory of 1400	2336	5df3470db00597e3da516459648dfa6a2c1564a57c1d51817d952beeeb860a2c.exe	82
PID 2336 wrote to memory of 1400	2336	5df3470db00597e3da516459648dfa6a2c1564a57c1d51817d952beeeb860a2c.exe	82
PID 2336 wrote to memory of 2604	2336	5df3470db00597e3da516459648dfa6a2c1564a57c1d51817d952beeeb860a2c.exe	84
PID 2336 wrote to memory of 2604	2336	5df3470db00597e3da516459648dfa6a2c1564a57c1d51817d952beeeb860a2c.exe	84
PID 2604 wrote to memory of 3968	2604	Client.exe	85
PID 2604 wrote to memory of 3968	2604	Client.exe	85

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\5df3470db00597e3da516459648dfa6a2c1564a57c1d51817d952beeeb860a2c.exe
"C:\Users\Admin\AppData\Local\Temp\5df3470db00597e3da516459648dfa6a2c1564a57c1d51817d952beeeb860a2c.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2336
- 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:1400
- 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:2604
- - 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:3968

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
1c1a86dad78326429577ab0b7b7b5858

SHA1
cf9aeb9a02d368918d89fc69d55b38829ab83039

SHA256
5df3470db00597e3da516459648dfa6a2c1564a57c1d51817d952beeeb860a2c

SHA512
db9658604a62090fd69cbb7504bf320c947473dfdb10be9e7e866af0a47db228755c1ff8e740eacbe20481df71bc5527347c4185e831515b30ab91b07e46b204

Download Submit
memory/2336-0-0x00007FFFF8853000-0x00007FFFF8855000-memory.dmp

Filesize
8KB

Download
memory/2336-1-0x00000000008B0000-0x0000000000BD4000-memory.dmp

Filesize
3.1MB

Download
memory/2336-2-0x00007FFFF8850000-0x00007FFFF9311000-memory.dmp

Filesize
10.8MB

Download
memory/2336-9-0x00007FFFF8850000-0x00007FFFF9311000-memory.dmp

Filesize
10.8MB

Download
memory/2604-10-0x00007FFFF8850000-0x00007FFFF9311000-memory.dmp

Filesize
10.8MB

Download
memory/2604-11-0x00007FFFF8850000-0x00007FFFF9311000-memory.dmp

Filesize
10.8MB

Download
memory/2604-12-0x000000001C820000-0x000000001C870000-memory.dmp

Filesize
320KB

Download
memory/2604-13-0x000000001C930000-0x000000001C9E2000-memory.dmp

Filesize
712KB

Download
memory/2604-14-0x00007FFFF8850000-0x00007FFFF9311000-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