quasar | 9a67ba0b0977ff291dc341c37a862d73242d005d5ac38ad1e7583f2d30273d41

General

Target

Bootstrapper_v2.19 (3).exe
Size

3.1MB
MD5

ef984ec5aacb3939bbe64180c7e1f84c
SHA1

25eb03b44465cd9b44da6d422df703bb41abd0e1
SHA256

9a67ba0b0977ff291dc341c37a862d73242d005d5ac38ad1e7583f2d30273d41
SHA512

d338d4ddb9073e2aebbf29a20ae83c02e979e4284d85dc905506dd098d36aa94f39483895f3e96619d33aad2dd34f537acf42eb6ba00756441d699eefff956d6
SSDEEP

49152:3vSI22SsaNYfdPBldt698dBcjHbqRJ65bR3LoGdLTHHB72eh2NT:3v/22SsaNYfdPBldt6+dBcjHbqRJ67

Score

10^/10

quasar office04 persistence spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

26.20.187.152:4782

Mutex

035609b7-5296-42b1-ba51-47722e1900ad

Attributes

encryption_key
EF9AF063C4E9C62FBBA2D6F12350A5C2F573D811
install_name
Bootstrapper_v2.19.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Microsoft
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/2360-1-0x00000000011C0000-0x00000000014E4000-memory.dmp	family_quasar
behavioral1/files/0x000900000001755b-6.dat	family_quasar
behavioral1/memory/2596-8-0x00000000012A0000-0x00000000015C4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2596	Bootstrapper_v2.19.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1163522206-1469769407-485553996-1000\Software\Microsoft\Windows\CurrentVersion\Run\Microsoft = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Bootstrapper_v2.19.exe\""	Bootstrapper_v2.19 (3).exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1163522206-1469769407-485553996-1000\Software\Microsoft\Windows\CurrentVersion\Run\Microsoft = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Bootstrapper_v2.19.exe\""	Bootstrapper_v2.19.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
400	schtasks.exe
2152	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2360	Bootstrapper_v2.19 (3).exe
Token: SeDebugPrivilege	2596	Bootstrapper_v2.19.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2596	Bootstrapper_v2.19.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2360 wrote to memory of 400	2360	Bootstrapper_v2.19 (3).exe	31
PID 2360 wrote to memory of 400	2360	Bootstrapper_v2.19 (3).exe	31
PID 2360 wrote to memory of 400	2360	Bootstrapper_v2.19 (3).exe	31
PID 2360 wrote to memory of 2596	2360	Bootstrapper_v2.19 (3).exe	33
PID 2360 wrote to memory of 2596	2360	Bootstrapper_v2.19 (3).exe	33
PID 2360 wrote to memory of 2596	2360	Bootstrapper_v2.19 (3).exe	33
PID 2596 wrote to memory of 2152	2596	Bootstrapper_v2.19.exe	34
PID 2596 wrote to memory of 2152	2596	Bootstrapper_v2.19.exe	34
PID 2596 wrote to memory of 2152	2596	Bootstrapper_v2.19.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\Bootstrapper_v2.19 (3).exe
"C:\Users\Admin\AppData\Local\Temp\Bootstrapper_v2.19 (3).exe"
1⤵
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2360
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Microsoft" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Bootstrapper_v2.19.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:400
- C:\Users\Admin\AppData\Roaming\SubDir\Bootstrapper_v2.19.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Bootstrapper_v2.19.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2596
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Microsoft" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Bootstrapper_v2.19.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2152

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Bootstrapper_v2.19.exe

Filesize
3.1MB

MD5
ef984ec5aacb3939bbe64180c7e1f84c

SHA1
25eb03b44465cd9b44da6d422df703bb41abd0e1

SHA256
9a67ba0b0977ff291dc341c37a862d73242d005d5ac38ad1e7583f2d30273d41

SHA512
d338d4ddb9073e2aebbf29a20ae83c02e979e4284d85dc905506dd098d36aa94f39483895f3e96619d33aad2dd34f537acf42eb6ba00756441d699eefff956d6

Download Submit
memory/2360-0-0x000007FEF5CB3000-0x000007FEF5CB4000-memory.dmp

Filesize
4KB

Download
memory/2360-1-0x00000000011C0000-0x00000000014E4000-memory.dmp

Filesize
3.1MB

Download
memory/2360-2-0x000007FEF5CB0000-0x000007FEF669C000-memory.dmp

Filesize
9.9MB

Download
memory/2360-9-0x000007FEF5CB0000-0x000007FEF669C000-memory.dmp

Filesize
9.9MB

Download
memory/2596-8-0x00000000012A0000-0x00000000015C4000-memory.dmp

Filesize
3.1MB

Download
memory/2596-10-0x000007FEF5CB0000-0x000007FEF669C000-memory.dmp

Filesize
9.9MB

Download
memory/2596-11-0x000007FEF5CB0000-0x000007FEF669C000-memory.dmp

Filesize
9.9MB

Download
memory/2596-12-0x000007FEF5CB0000-0x000007FEF669C000-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