quasar | aea58b72a2a36d5f0401caba08756cad63465d1b40466cb77809f554b6e5d02b

Analysis

max time kernel
117s
max time network
127s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
08-02-2025 17:48

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General

Target

Client-built.exe
Size

3.1MB
MD5

a72eb9413e621f09991cb29a3a1209c0
SHA1

ff376c2982c20f671c9d282fa9891c17d2dd7f8d
SHA256

aea58b72a2a36d5f0401caba08756cad63465d1b40466cb77809f554b6e5d02b
SHA512

ef7c21b9b59eb28764c36392635a256dccc2b67896c384736da6ebb30166a2c565550b9967fa206262dcbad5d08e340edf2ea41d897a5b3ba4ced218e3354a3d
SSDEEP

49152:KveI22SsaNYfdPBldt698dBcjHk7RJ6QbR3LoGdmTHHB72eh2NT:KvT22SsaNYfdPBldt6+dBcjHk7RJ6q

Score

10^/10

quasar office04 discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.0.254:4782

Mutex

b5c485dd-0be7-4175-9240-b94d067a1289

Attributes

encryption_key
ACAEE58B1EF31BFCC4D37857EF8688477F9EBF41
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
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/2240-1-0x0000000000D70000-0x0000000001094000-memory.dmp	family_quasar
behavioral1/files/0x0012000000016d3f-5.dat	family_quasar
behavioral1/memory/2976-9-0x00000000002F0000-0x0000000000614000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2976	Client.exe

Browser Information Discovery 1 TTPs
Enumerate browser information.
discovery

Browser Information Discovery
T1217
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS	chrome.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemProductName	chrome.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemManufacturer	chrome.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
2848	schtasks.exe
2856	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1816	chrome.exe
1816	chrome.exe

Suspicious use of AdjustPrivilegeToken 22 IoCs

description	pid	Process
Token: SeDebugPrivilege	2240	Client-built.exe
Token: SeDebugPrivilege	2976	Client.exe
Token: 33	2508	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	2508	AUDIODG.EXE
Token: 33	2508	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	2508	AUDIODG.EXE
Token: SeShutdownPrivilege	1816	chrome.exe
Token: SeShutdownPrivilege	1816	chrome.exe
Token: SeShutdownPrivilege	1816	chrome.exe
Token: SeShutdownPrivilege	1816	chrome.exe
Token: SeShutdownPrivilege	1816	chrome.exe
Token: SeShutdownPrivilege	1816	chrome.exe
Token: SeShutdownPrivilege	1816	chrome.exe
Token: SeShutdownPrivilege	1816	chrome.exe
Token: SeShutdownPrivilege	1816	chrome.exe
Token: SeShutdownPrivilege	1816	chrome.exe
Token: SeShutdownPrivilege	1816	chrome.exe
Token: SeShutdownPrivilege	1816	chrome.exe
Token: SeShutdownPrivilege	1816	chrome.exe
Token: SeShutdownPrivilege	1816	chrome.exe
Token: SeShutdownPrivilege	1816	chrome.exe
Token: SeShutdownPrivilege	1816	chrome.exe

Suspicious use of FindShellTrayWindow 36 IoCs

pid	Process
2976	Client.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe

Suspicious use of SendNotifyMessage 33 IoCs

pid	Process
2976	Client.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe
1816	chrome.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2976	Client.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 2240 wrote to memory of 2848	2240	Client-built.exe	30
PID 2240 wrote to memory of 2848	2240	Client-built.exe	30
PID 2240 wrote to memory of 2848	2240	Client-built.exe	30
PID 2240 wrote to memory of 2976	2240	Client-built.exe	32
PID 2240 wrote to memory of 2976	2240	Client-built.exe	32
PID 2240 wrote to memory of 2976	2240	Client-built.exe	32
PID 2976 wrote to memory of 2856	2976	Client.exe	33
PID 2976 wrote to memory of 2856	2976	Client.exe	33
PID 2976 wrote to memory of 2856	2976	Client.exe	33
PID 1816 wrote to memory of 2192	1816	chrome.exe	42
PID 1816 wrote to memory of 2192	1816	chrome.exe	42
PID 1816 wrote to memory of 2192	1816	chrome.exe	42
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 2104	1816	chrome.exe	44
PID 1816 wrote to memory of 392	1816	chrome.exe	45
PID 1816 wrote to memory of 392	1816	chrome.exe	45
PID 1816 wrote to memory of 392	1816	chrome.exe	45
PID 1816 wrote to memory of 908	1816	chrome.exe	46
PID 1816 wrote to memory of 908	1816	chrome.exe	46
PID 1816 wrote to memory of 908	1816	chrome.exe	46
PID 1816 wrote to memory of 908	1816	chrome.exe	46
PID 1816 wrote to memory of 908	1816	chrome.exe	46
PID 1816 wrote to memory of 908	1816	chrome.exe	46
PID 1816 wrote to memory of 908	1816	chrome.exe	46
PID 1816 wrote to memory of 908	1816	chrome.exe	46
PID 1816 wrote to memory of 908	1816	chrome.exe	46
PID 1816 wrote to memory of 908	1816	chrome.exe	46

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⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2240
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2848
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2976
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2856

C:\Windows\explorer.exe
"C:\Windows\explorer.exe"
1⤵
PID:2556

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0x5d8
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2508

C:\Program Files\Google\Chrome\Application\chrome.exe
"C:\Program Files\Google\Chrome\Application\chrome.exe"
1⤵
- Enumerates system info in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1816
- C:\Program Files\Google\Chrome\Application\chrome.exe
  "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=crashpad-handler "--user-data-dir=C:\Users\Admin\AppData\Local\Google\Chrome\User Data" /prefetch:7 --monitor-self-annotation=ptype=crashpad-handler "--database=C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Crashpad" "--metrics-dir=C:\Users\Admin\AppData\Local\Google\Chrome\User Data" --url=https://clients2.google.com/cr/report --annotation=channel= --annotation=plat=Win64 --annotation=prod=Chrome --annotation=ver=106.0.5249.119 --initial-client-data=0xc0,0xc4,0xc8,0x94,0xcc,0x7feef2d9758,0x7feef2d9768,0x7feef2d9778
  2⤵
  PID:2192
- C:\Program Files\Google\Chrome\Application\chrome.exe
  "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=gpu-process --gpu-preferences=UAAAAAAAAADgAAAYAAAAAAAAAAAAAAAAAABgAAAAAAAwAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAEgAAAAAAAAASAAAAAAAAAAYAAAAAgAAABAAAAAAAAAAGAAAAAAAAAAQAAAAAAAAAAAAAAAOAAAAEAAAAAAAAAABAAAADgAAAAgAAAAAAAAACAAAAAAAAAA= --mojo-platform-channel-handle=1160 --field-trial-handle=1288,i,1780913456032714783,3974285409021221639,131072 /prefetch:2
  2⤵
  PID:2104
- C:\Program Files\Google\Chrome\Application\chrome.exe
  "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=1540 --field-trial-handle=1288,i,1780913456032714783,3974285409021221639,131072 /prefetch:8
  2⤵
  PID:392
- C:\Program Files\Google\Chrome\Application\chrome.exe
  "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=storage.mojom.StorageService --lang=en-US --service-sandbox-type=utility --mojo-platform-channel-handle=1644 --field-trial-handle=1288,i,1780913456032714783,3974285409021221639,131072 /prefetch:8
  2⤵
  PID:908
- C:\Program Files\Google\Chrome\Application\chrome.exe
  "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --display-capture-permissions-policy-allowed --first-renderer-process --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=6 --mojo-platform-channel-handle=2140 --field-trial-handle=1288,i,1780913456032714783,3974285409021221639,131072 /prefetch:1
  2⤵
  PID:812
- C:\Program Files\Google\Chrome\Application\chrome.exe
  "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --display-capture-permissions-policy-allowed --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=5 --mojo-platform-channel-handle=2348 --field-trial-handle=1288,i,1780913456032714783,3974285409021221639,131072 /prefetch:1
  2⤵
  PID:2068
- C:\Program Files\Google\Chrome\Application\chrome.exe
  "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=gpu-process --gpu-preferences=UAAAAAAAAADgAAAYAAAAAAAAAAAAAAAAAABgAAAAAAAwAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAEgAAAAAAAAASAAAAAAAAAAYAAAAAgAAABAAAAAAAAAAGAAAAAAAAAAQAAAAAAAAAAAAAAAOAAAAEAAAAAAAAAABAAAADgAAAAgAAAAAAAAACAAAAAAAAAA= --use-gl=angle --use-angle=swiftshader-webgl --mojo-platform-channel-handle=1144 --field-trial-handle=1288,i,1780913456032714783,3974285409021221639,131072 /prefetch:2
  2⤵
  PID:2924
- C:\Program Files\Google\Chrome\Application\chrome.exe
  "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --display-capture-permissions-policy-allowed --disable-gpu-compositing --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=8 --mojo-platform-channel-handle=3228 --field-trial-handle=1288,i,1780913456032714783,3974285409021221639,131072 /prefetch:1
  2⤵
  PID:3012
- C:\Program Files\Google\Chrome\Application\chrome.exe
  "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=data_decoder.mojom.DataDecoderService --lang=en-US --service-sandbox-type=service --mojo-platform-channel-handle=3464 --field-trial-handle=1288,i,1780913456032714783,3974285409021221639,131072 /prefetch:8
  2⤵
  PID:1476
- C:\Program Files\Google\Chrome\Application\chrome.exe
  "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=data_decoder.mojom.DataDecoderService --lang=en-US --service-sandbox-type=service --mojo-platform-channel-handle=3592 --field-trial-handle=1288,i,1780913456032714783,3974285409021221639,131072 /prefetch:8
  2⤵
  PID:2100
- C:\Program Files\Google\Chrome\Application\chrome.exe
  "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=chrome.mojom.UtilWin --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=3832 --field-trial-handle=1288,i,1780913456032714783,3974285409021221639,131072 /prefetch:8
  2⤵
  PID:2020

C:\Program Files\Google\Chrome\Application\106.0.5249.119\elevation_service.exe
"C:\Program Files\Google\Chrome\Application\106.0.5249.119\elevation_service.exe"
1⤵
PID:1692

C:\Windows\explorer.exe
"C:\Windows\explorer.exe"
1⤵
PID:2744

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Browser Information Discovery

T1217

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Google\Chrome\User Data\2ecf9f29-3fe5-4e4c-805f-17b9b26c4299.tmp

Filesize
357KB

MD5
9de99de02a2561524c6df610f80fe4ef

SHA1
64783f5e1ea1a4d933977c326df40d320d032051

SHA256
d7b6223891f65a56716ead3662fbb2255bd3b5761834fb963376d404a0d6d1cf

SHA512
290bd5b571d4d2b24e80cea8828adf22a7c36aede26089674a227caa44167e93fca2a89f457a18230b9c87f94ca6d067a8ed7b536f16217a51c56cc506392712

Download Submit
C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\GPUCache\data_1

Filesize
264KB

MD5
f50f89a0a91564d0b8a211f8921aa7de

SHA1
112403a17dd69d5b9018b8cede023cb3b54eab7d

SHA256
b1e963d702392fb7224786e7d56d43973e9b9efd1b89c17814d7c558ffc0cdec

SHA512
bf8cda48cf1ec4e73f0dd1d4fa5562af1836120214edb74957430cd3e4a2783e801fa3f4ed2afb375257caeed4abe958265237d6e0aacf35a9ede7a2e8898d58

Download Submit
C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Sync Data\LevelDB\CURRENT

Filesize
16B

MD5
18e723571b00fb1694a3bad6c78e4054

SHA1
afcc0ef32d46fe59e0483f9a3c891d3034d12f32

SHA256
8af72f43857550b01eab1019335772b367a17a9884a7a759fdf4fe6f272b90aa

SHA512
43bb0af7d3984012d2d67ca6b71f0201e5b948e6fe26a899641c4c6f066c59906d468ddf7f1df5ea5fa33c2bc5ea8219c0f2c82e0a5c365ad7581b898a8859e2

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
a72eb9413e621f09991cb29a3a1209c0

SHA1
ff376c2982c20f671c9d282fa9891c17d2dd7f8d

SHA256
aea58b72a2a36d5f0401caba08756cad63465d1b40466cb77809f554b6e5d02b

SHA512
ef7c21b9b59eb28764c36392635a256dccc2b67896c384736da6ebb30166a2c565550b9967fa206262dcbad5d08e340edf2ea41d897a5b3ba4ced218e3354a3d

Download Submit
memory/2240-7-0x000007FEF6420000-0x000007FEF6E0C000-memory.dmp

Filesize
9.9MB

Download
memory/2240-0-0x000007FEF6423000-0x000007FEF6424000-memory.dmp

Filesize
4KB

Download
memory/2240-2-0x000007FEF6420000-0x000007FEF6E0C000-memory.dmp

Filesize
9.9MB

Download
memory/2240-1-0x0000000000D70000-0x0000000001094000-memory.dmp

Filesize
3.1MB

Download
memory/2976-9-0x00000000002F0000-0x0000000000614000-memory.dmp

Filesize
3.1MB

Download
memory/2976-10-0x000007FEF6420000-0x000007FEF6E0C000-memory.dmp

Filesize
9.9MB

Download
memory/2976-11-0x000007FEF6420000-0x000007FEF6E0C000-memory.dmp

Filesize
9.9MB

Download
memory/2976-8-0x000007FEF6420000-0x000007FEF6E0C000-memory.dmp

Filesize
9.9MB

Download