quasar | a488ba7f4d75e48b8787334964387a4faad66325cb936d787961f44425da64cd

General

Target

5665565656built.exe
Size

3.1MB
MD5

8c6676c96bfafd539a524a861c7db29e
SHA1

68434ca1ae2d767321f3782c43db49ee58ca1ef3
SHA256

a488ba7f4d75e48b8787334964387a4faad66325cb936d787961f44425da64cd
SHA512

3a1217f72a9c9b1e103bfc37dc1780856fb0707e556adae49939efc984e87b6ebac8ad7b789a44cb5547ea8f7218a5b20240ff9bd39d7cac097fb2e958777771
SSDEEP

49152:Kvgt62XlaSFNWPjljiFa2RoUYIJwUEY8/k/ZS+oGdETHHB72eh2NT:KvM62XlaSFNWPjljiFXRoUYIJwcP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.0.19:4782

Mutex

1e9f8223-5a3f-41e5-8f04-ce7b2efc9706

Attributes

encryption_key
CA0623419E058E855A1DFBA27E90975947AE225F
install_name
Client.exe
log_directory
Logs
reconnect_delay
50
startup_key
SubDir
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/2040-1-0x00000000012E0000-0x0000000001604000-memory.dmp	family_quasar
behavioral1/files/0x0009000000016bf7-6.dat	family_quasar
behavioral1/memory/1248-9-0x0000000000980000-0x0000000000CA4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1248	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	5665565656built.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	5665565656built.exe
File opened for modification	C:\Windows\system32\SubDir	5665565656built.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
2104	schtasks.exe
2196	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2040	5665565656built.exe
Token: SeDebugPrivilege	1248	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1248	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2040 wrote to memory of 2104	2040	5665565656built.exe	30
PID 2040 wrote to memory of 2104	2040	5665565656built.exe	30
PID 2040 wrote to memory of 2104	2040	5665565656built.exe	30
PID 2040 wrote to memory of 1248	2040	5665565656built.exe	32
PID 2040 wrote to memory of 1248	2040	5665565656built.exe	32
PID 2040 wrote to memory of 1248	2040	5665565656built.exe	32
PID 1248 wrote to memory of 2196	1248	Client.exe	33
PID 1248 wrote to memory of 2196	1248	Client.exe	33
PID 1248 wrote to memory of 2196	1248	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\5665565656built.exe
"C:\Users\Admin\AppData\Local\Temp\5665565656built.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2040
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "SubDir" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2104
- 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 SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1248
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "SubDir" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2196

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:\Windows\System32\SubDir\Client.exe

Filesize
3.1MB

MD5
8c6676c96bfafd539a524a861c7db29e

SHA1
68434ca1ae2d767321f3782c43db49ee58ca1ef3

SHA256
a488ba7f4d75e48b8787334964387a4faad66325cb936d787961f44425da64cd

SHA512
3a1217f72a9c9b1e103bfc37dc1780856fb0707e556adae49939efc984e87b6ebac8ad7b789a44cb5547ea8f7218a5b20240ff9bd39d7cac097fb2e958777771

Download Submit
memory/1248-11-0x000007FEF5400000-0x000007FEF5DEC000-memory.dmp

Filesize
9.9MB

Download
memory/1248-9-0x0000000000980000-0x0000000000CA4000-memory.dmp

Filesize
3.1MB

Download
memory/1248-8-0x000007FEF5400000-0x000007FEF5DEC000-memory.dmp

Filesize
9.9MB

Download
memory/1248-12-0x000007FEF5400000-0x000007FEF5DEC000-memory.dmp

Filesize
9.9MB

Download
memory/2040-0-0x000007FEF5403000-0x000007FEF5404000-memory.dmp

Filesize
4KB

Download
memory/2040-1-0x00000000012E0000-0x0000000001604000-memory.dmp

Filesize
3.1MB

Download
memory/2040-2-0x000007FEF5400000-0x000007FEF5DEC000-memory.dmp

Filesize
9.9MB

Download
memory/2040-10-0x000007FEF5400000-0x000007FEF5DEC000-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