quasar | dd1ff957df241c8301de5be805cbe9c484a9d3768e657afffc83a0697f881674

General

Target

Client-built.exe
Size

1.5MB
MD5

efdf48328fd93af977682db2ac7b56ce
SHA1

006abc06af3cdc20dd52588beb5ce4f13273f2db
SHA256

dd1ff957df241c8301de5be805cbe9c484a9d3768e657afffc83a0697f881674
SHA512

30f723977dd6006954f6fc19c23abf421c11a00845ba9dbbd9a465ce6c7a023f96bc641023a1833605cc0306d1e4a7371cee7e2f31bb755d02c25f548949f8d3
SSDEEP

24576:uU1R7bTS2eWBRwRR16zhHIPbcNK0KKm77yviUSQaZaOwI55l2S62r9exnXWiA1Qx:uqRR7wR2EgKKm77LrwCB6T+1Q

Score

10^/10

quasar spyware trojan

Malware Config

Extracted

Family

quasar

Attributes

encryption_key
1FB7485171FF20CDA99F01C1B832D8813FC1E606
reconnect_delay
3000
startup_key
�&)M-Im�� c�hp��C��.��

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/1268-1-0x000001A0085F0000-0x000001A008782000-memory.dmp	family_quasar
behavioral2/files/0x001900000002b202-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4940	Client.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client-built.exe

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

System Information Discovery
T1082

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
1040	timeout.exe

Modifies system certificate store 2 TTPs 2 IoCs

defense_evasion spyware trojan

Install Root Certificate

T1553.004

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349	Client.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349\Blob = 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	Client.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
2712	schtasks.exe
5112	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
4940	Client.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1268	Client-built.exe
Token: SeDebugPrivilege	4940	Client.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 1268 wrote to memory of 2712	1268	Client-built.exe	83
PID 1268 wrote to memory of 2712	1268	Client-built.exe	83
PID 1268 wrote to memory of 4940	1268	Client-built.exe	85
PID 1268 wrote to memory of 4940	1268	Client-built.exe	85
PID 4940 wrote to memory of 5112	4940	Client.exe	86
PID 4940 wrote to memory of 5112	4940	Client.exe	86
PID 4940 wrote to memory of 5456	4940	Client.exe	90
PID 4940 wrote to memory of 5456	4940	Client.exe	90
PID 4940 wrote to memory of 1120	4940	Client.exe	92
PID 4940 wrote to memory of 1120	4940	Client.exe	92
PID 1120 wrote to memory of 5196	1120	cmd.exe	94
PID 1120 wrote to memory of 5196	1120	cmd.exe	94
PID 1120 wrote to memory of 1040	1120	cmd.exe	95
PID 1120 wrote to memory of 1040	1120	cmd.exe	95

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 System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1268
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Pulsar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2712
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Modifies system certificate store
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4940
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Pulsar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:5112
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /delete /tn "Pulsar Client Startup" /f
    3⤵
    PID:5456
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\Y98xZsl7JCTF.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1120
  - - C:\Windows\system32\chcp.com
      chcp 65001
      4⤵
      PID:5196
  - - C:\Windows\system32\timeout.exe
      timeout /T 5 /NOBREAK
      4⤵
      Delays execution with timeout.exe
      PID:1040

Network

MITRE ATT&CK Enterprise v16

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

Modify Registry

1

T1112

Subvert Trust Controls

1

T1553

Install Root Certificate

1

T1553.004

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\Y98xZsl7JCTF.bat

Filesize
201B

MD5
3de467fea8ce57950742659bf12c44ff

SHA1
d0504505cb23356ad788c78850f8f4921d5b6b16

SHA256
822f7293fc62f223b7edf33e8f1ab5f230d220dd18dfadc3099891ecb6d8dfd2

SHA512
07460fd86847dd1c623bfac54e94dd769147d4d014ff80f7144e66a051aeb93460850a5c3fe3bd16c25fc9c985af0a9ec4ff675e85ffed5f2ddf12c5675b824c

Download Submit
C:\Windows\System32\SubDir\Client.exe

Filesize
1.5MB

MD5
efdf48328fd93af977682db2ac7b56ce

SHA1
006abc06af3cdc20dd52588beb5ce4f13273f2db

SHA256
dd1ff957df241c8301de5be805cbe9c484a9d3768e657afffc83a0697f881674

SHA512
30f723977dd6006954f6fc19c23abf421c11a00845ba9dbbd9a465ce6c7a023f96bc641023a1833605cc0306d1e4a7371cee7e2f31bb755d02c25f548949f8d3

Download Submit
memory/1268-0-0x00007FFD03C53000-0x00007FFD03C55000-memory.dmp

Filesize
8KB

Download
memory/1268-1-0x000001A0085F0000-0x000001A008782000-memory.dmp

Filesize
1.6MB

Download
memory/1268-2-0x000001A008BC0000-0x000001A008BDA000-memory.dmp

Filesize
104KB

Download
memory/1268-3-0x00007FFD03C50000-0x00007FFD04712000-memory.dmp

Filesize
10.8MB

Download
memory/1268-9-0x00007FFD03C50000-0x00007FFD04712000-memory.dmp

Filesize
10.8MB

Download
memory/4940-15-0x00000237AE680000-0x00000237AE6CE000-memory.dmp

Filesize
312KB

Download
memory/4940-18-0x00000237C73F0000-0x00000237C741A000-memory.dmp

Filesize
168KB

Download
memory/4940-13-0x00000237C70D0000-0x00000237C7120000-memory.dmp

Filesize
320KB

Download
memory/4940-11-0x00007FFD03C50000-0x00007FFD04712000-memory.dmp

Filesize
10.8MB

Download
memory/4940-14-0x00000237C7460000-0x00000237C7512000-memory.dmp

Filesize
712KB

Download
memory/4940-17-0x00000237C73A0000-0x00000237C73EA000-memory.dmp

Filesize
296KB

Download
memory/4940-16-0x00000237C7120000-0x00000237C716C000-memory.dmp

Filesize
304KB

Download
memory/4940-12-0x00000237AE640000-0x00000237AE67A000-memory.dmp

Filesize
232KB

Download
memory/4940-21-0x00000237C7A70000-0x00000237C7A82000-memory.dmp

Filesize
72KB

Download
memory/4940-22-0x00000237C7AD0000-0x00000237C7B0C000-memory.dmp

Filesize
240KB

Download
memory/4940-23-0x00007FFD03C50000-0x00007FFD04712000-memory.dmp

Filesize
10.8MB

Download
memory/4940-24-0x00007FFD03C50000-0x00007FFD04712000-memory.dmp

Filesize
10.8MB

Download
memory/4940-10-0x00007FFD03C50000-0x00007FFD04712000-memory.dmp

Filesize
10.8MB

Download
memory/4940-30-0x00007FFD03C50000-0x00007FFD04712000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads