quasar | 2cd40802f898dd95f0756aa6c44263c38131379d0db2da72f37bfa8f53668412

Analysis

max time kernel
1791s
max time network
1792s
platform
windows10-2004_x64
resource
win10v2004-20231127-en
resource tags

arch:x64arch:x86image:win10v2004-20231127-enlocale:en-usos:windows10-2004-x64system
submitted
09-12-2023 01:16

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General

Target

winnnn.exe
Size

3.1MB
MD5

94b66c3142933d8414614b25129de4f6
SHA1

77f04ff0308d49aadd34c5082b691118b26fe949
SHA256

8b757b585ccc9a12ad57fe10fa901d3ab17ee33b7475978c891cae4f1fb00a84
SHA512

afdaab59cddc58d560f81dc959278984b2352a91cb5132d577f7e0d562456162807178fb7dab47578511ab5a2f1630d2f65fcdad84d167ccb862587d3845727d
SSDEEP

49152:DvrI22SsaNYfdPBldt698dBcjH4hRJ6abR3LoGdh0THHB72eh2NT:DvU22SsaNYfdPBldt6+dBcjH4hRJ60

Score

10^/10

quasar windows update spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Windows Update

141.98.112.144:4782

192.168.1.1:4782

Mutex

43e4244e-f515-4759-a0f9-81d1dfceed2f

Attributes

encryption_key
535B385BFDC78C4C5A8DEE5D1390F4841681628D
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Update
subdirectory
SubDir

Signatures

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

Quasar payload 1 IoCs

Processes:

resource	yara_rule
behavioral5/memory/5096-0-0x0000000000530000-0x0000000000854000-memory.dmp	family_quasar

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exe

pid process

3732 schtasks.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

winnnn.exe

description pid process

Token: SeDebugPrivilege 5096 winnnn.exe
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

winnnn.exe

pid process

5096 winnnn.exe
5096 winnnn.exe
Suspicious use of SendNotifyMessage 2 IoCs

Processes:

winnnn.exe

pid process

5096 winnnn.exe
5096 winnnn.exe

pid	process
3732	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	5096	winnnn.exe

pid	process
5096	winnnn.exe
5096	winnnn.exe

pid	process
5096	winnnn.exe
5096	winnnn.exe

Suspicious use of WriteProcessMemory 2 IoCs

Processes:

winnnn.exe

description	pid	process	target process
PID 5096 wrote to memory of 3732	5096	winnnn.exe	schtasks.exe
PID 5096 wrote to memory of 3732	5096	winnnn.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\winnnn.exe
"C:\Users\Admin\AppData\Local\Temp\winnnn.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:5096

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:3732

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Query Registry

T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

memory/5096-0-0x0000000000530000-0x0000000000854000-memory.dmp

Filesize
3.1MB

Download
memory/5096-1-0x00007FFE46F20000-0x00007FFE479E1000-memory.dmp

Filesize
10.8MB

Download
memory/5096-2-0x000000001B460000-0x000000001B470000-memory.dmp

Filesize
64KB

Download
memory/5096-3-0x000000001C050000-0x000000001C0A0000-memory.dmp

Filesize
320KB

Download
memory/5096-4-0x000000001C160000-0x000000001C212000-memory.dmp

Filesize
712KB

Download
memory/5096-7-0x000000001C0C0000-0x000000001C0D2000-memory.dmp

Filesize
72KB

Download
memory/5096-8-0x000000001C120000-0x000000001C15C000-memory.dmp

Filesize
240KB

Download
memory/5096-9-0x000000001C020000-0x000000001C036000-memory.dmp

Filesize
88KB

Download
memory/5096-10-0x00007FFE46F20000-0x00007FFE479E1000-memory.dmp

Filesize
10.8MB

Download
memory/5096-12-0x000000001B460000-0x000000001B470000-memory.dmp

Filesize
64KB

Download