quasar | d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75

Analysis

max time kernel
146s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20230221-en
resource tags

arch:x64arch:x86image:win10v2004-20230221-enlocale:en-usos:windows10-2004-x64system
submitted
07-05-2023 09:23

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General

Target

wf4780.exe
Size

2.8MB
MD5

ec4951e9f2b1945815954fec161cf57a
SHA1

8e9e6857a0251a89b9c43b650344fb4f1648fa76
SHA256

d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75
SHA512

596e28d3529be33483589973ac34410f574cd888bda74e1e24afb2a2de107af4e788e2a27648da3c4fe4db4f49184244ce6ccf50f480c95c8d252d541587ad15
SSDEEP

49152:y/Cbs48/vm/XpRDVHFZuAzG5LfvUza32ehyfT36:y/Ob8/vm/XnDVHbs

Score

10^/10

quasar x spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

45.141.27.208:4780

127.0.0.1:4780

Mutex

d6e77ea9-bff7-4566-b4dd-f1be3c293c5e

Attributes

encryption_key
57F667877C1FCDA6663E2FDAC6FB8CFDE3CEA957
install_name
winx.exe
log_directory
Logs
reconnect_delay
3000
startup_key
winx
subdirectory
sys

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1732-133-0x0000000000AC0000-0x0000000000D8A000-memory.dmp	family_quasar
C:\Windows\System32\sys\winx.exe	family_quasar
C:\Windows\system32\sys\winx.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

winx.exe

pid process

3232 winx.exe
Looks up external IP address via web service 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

13 api.ipify.org
14 api.ipify.org

pid	process
3232	winx.exe

flow	ioc
13	api.ipify.org
14	api.ipify.org

Drops file in System32 directory 5 IoCs

Processes:

wf4780.exewinx.exe

description	ioc	process
File created	C:\Windows\system32\sys\winx.exe	wf4780.exe
File opened for modification	C:\Windows\system32\sys\winx.exe	wf4780.exe
File opened for modification	C:\Windows\system32\sys	wf4780.exe
File opened for modification	C:\Windows\system32\sys\winx.exe	winx.exe
File opened for modification	C:\Windows\system32\sys	winx.exe

Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exeschtasks.exe

pid process

2000 schtasks.exe
1056 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

wf4780.exewinx.exe

description pid process

Token: SeDebugPrivilege 1732 wf4780.exe
Token: SeDebugPrivilege 3232 winx.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

winx.exe

pid process

3232 winx.exe

pid	process
2000	schtasks.exe
1056	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	1732	wf4780.exe
Token: SeDebugPrivilege	3232	winx.exe

pid	process
3232	winx.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

wf4780.exewinx.exe

description	pid	process	target process
PID 1732 wrote to memory of 2000	1732	wf4780.exe	schtasks.exe
PID 1732 wrote to memory of 2000	1732	wf4780.exe	schtasks.exe
PID 1732 wrote to memory of 3232	1732	wf4780.exe	winx.exe
PID 1732 wrote to memory of 3232	1732	wf4780.exe	winx.exe
PID 3232 wrote to memory of 1056	3232	winx.exe	schtasks.exe
PID 3232 wrote to memory of 1056	3232	winx.exe	schtasks.exe

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\wf4780.exe
"C:\Users\Admin\AppData\Local\Temp\wf4780.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1732
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "winx" /sc ONLOGON /tr "C:\Windows\system32\sys\winx.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:2000
- C:\Windows\system32\sys\winx.exe
  "C:\Windows\system32\sys\winx.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3232
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "winx" /sc ONLOGON /tr "C:\Windows\system32\sys\winx.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:1056

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\System32\sys\winx.exe

Filesize
2.8MB

MD5
ec4951e9f2b1945815954fec161cf57a

SHA1
8e9e6857a0251a89b9c43b650344fb4f1648fa76

SHA256
d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75

SHA512
596e28d3529be33483589973ac34410f574cd888bda74e1e24afb2a2de107af4e788e2a27648da3c4fe4db4f49184244ce6ccf50f480c95c8d252d541587ad15

Download Submit
C:\Windows\system32\sys\winx.exe

Filesize
2.8MB

MD5
ec4951e9f2b1945815954fec161cf57a

SHA1
8e9e6857a0251a89b9c43b650344fb4f1648fa76

SHA256
d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75

SHA512
596e28d3529be33483589973ac34410f574cd888bda74e1e24afb2a2de107af4e788e2a27648da3c4fe4db4f49184244ce6ccf50f480c95c8d252d541587ad15

Download Submit
memory/1732-133-0x0000000000AC0000-0x0000000000D8A000-memory.dmp

Filesize
2.8MB

Download
memory/1732-134-0x000000001B9A0000-0x000000001B9B0000-memory.dmp

Filesize
64KB

Download
memory/3232-141-0x000000001B3B0000-0x000000001B3C0000-memory.dmp

Filesize
64KB

Download
memory/3232-142-0x00000000026C0000-0x0000000002710000-memory.dmp

Filesize
320KB

Download
memory/3232-143-0x000000001BDC0000-0x000000001BE72000-memory.dmp

Filesize
712KB

Download
memory/3232-146-0x000000001B3B0000-0x000000001B3C0000-memory.dmp

Filesize
64KB

Download