quasar | 39555aeefdaa195d8e046990520ed406f2600cffa40d70a276f588081483d339

General

Target

Client-built.exe
Size

3.2MB
MD5

673a9eb49a4d5e00a7280b5ae2d8fcd5
SHA1

83dfed7433dd0fef1c654d4fe8d3a3a03d47fb2a
SHA256

39555aeefdaa195d8e046990520ed406f2600cffa40d70a276f588081483d339
SHA512

8341e8f08b03affb5e1912084f532f6cda5c05e8b6dda949aa04d26d2e52cbb415411e00354b1824520651b20e533153c88f094848d1b9e74409057b6dd79c9a
SSDEEP

49152:QvAt62XlaSFNWPjljiFa2RoUYIMORJ6LbR3LoGdYTHHB72eh2NT:Qvs62XlaSFNWPjljiFXRoUYIMORJ6d

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.209:4782

Mutex

d942a9a5-3785-41ac-a7db-12e8f1fb6c3d

Attributes

encryption_key
E662E8B331BDD6D3B27E1C68FDDE49A9178AEBE8
install_name
A.exe
log_directory
Logs
reconnect_delay
3000
startup_key
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
behavioral1/memory/4228-1-0x0000000000320000-0x0000000000654000-memory.dmp	family_quasar
behavioral1/files/0x001d00000002aab6-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1216	A.exe

Drops file in Program Files directory 5 IoCs

description	ioc	Process
File created	C:\Program Files\SubDir\A.exe	Client-built.exe
File opened for modification	C:\Program Files\SubDir\A.exe	Client-built.exe
File opened for modification	C:\Program Files\SubDir	Client-built.exe
File opened for modification	C:\Program Files\SubDir\A.exe	A.exe
File opened for modification	C:\Program Files\SubDir	A.exe

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
4536	schtasks.exe
3368	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4228	Client-built.exe
Token: SeDebugPrivilege	1216	A.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1216	A.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4228 wrote to memory of 4536	4228	Client-built.exe	77
PID 4228 wrote to memory of 4536	4228	Client-built.exe	77
PID 4228 wrote to memory of 1216	4228	Client-built.exe	79
PID 4228 wrote to memory of 1216	4228	Client-built.exe	79
PID 1216 wrote to memory of 3368	1216	A.exe	80
PID 1216 wrote to memory of 3368	1216	A.exe	80

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 Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4228
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\A.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4536
- C:\Program Files\SubDir\A.exe
  "C:\Program Files\SubDir\A.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in Program Files directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1216
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\A.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3368

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:1760

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Program Files\SubDir\A.exe

Filesize
3.2MB

MD5
673a9eb49a4d5e00a7280b5ae2d8fcd5

SHA1
83dfed7433dd0fef1c654d4fe8d3a3a03d47fb2a

SHA256
39555aeefdaa195d8e046990520ed406f2600cffa40d70a276f588081483d339

SHA512
8341e8f08b03affb5e1912084f532f6cda5c05e8b6dda949aa04d26d2e52cbb415411e00354b1824520651b20e533153c88f094848d1b9e74409057b6dd79c9a

Download Submit
memory/1216-10-0x00007FF8E3FC0000-0x00007FF8E4A82000-memory.dmp

Filesize
10.8MB

Download
memory/1216-11-0x00007FF8E3FC0000-0x00007FF8E4A82000-memory.dmp

Filesize
10.8MB

Download
memory/1216-12-0x000000001C040000-0x000000001C090000-memory.dmp

Filesize
320KB

Download
memory/1216-13-0x000000001C890000-0x000000001C942000-memory.dmp

Filesize
712KB

Download
memory/1216-14-0x00007FF8E3FC0000-0x00007FF8E4A82000-memory.dmp

Filesize
10.8MB

Download
memory/1216-15-0x000000001D1D0000-0x000000001D6F8000-memory.dmp

Filesize
5.2MB

Download
memory/4228-0-0x00007FF8E3FC3000-0x00007FF8E3FC5000-memory.dmp

Filesize
8KB

Download
memory/4228-1-0x0000000000320000-0x0000000000654000-memory.dmp

Filesize
3.2MB

Download
memory/4228-2-0x00007FF8E3FC0000-0x00007FF8E4A82000-memory.dmp

Filesize
10.8MB

Download
memory/4228-9-0x00007FF8E3FC0000-0x00007FF8E4A82000-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