quasar | c6f8be78988d98bbc1f083b60acec86fed6259515277bc74b1eb138d1c151c82

Analysis

max time kernel
40s
max time network
50s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
22-01-2025 22:46

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Reason

Machine shutdown

Report Analysis Logs

General

Target

Client-built.exe
Size

3.1MB
MD5

9c5ec5683c91176f1146cbc9b427e518
SHA1

2eccfa9607f1a9023079c4f88aa72b5a552bed70
SHA256

c6f8be78988d98bbc1f083b60acec86fed6259515277bc74b1eb138d1c151c82
SHA512

5aa2bc8d741b10e1d94431db71e69d6d19f1ca52cafc3580c2efcae45c82d74932b42a969a9ef69973aaa799809cef648477fae5356f456953d29335fe854fcc
SSDEEP

49152:mvyI22SsaNYfdPBldt698dBcjHll6bs1JGLoGdd8FiTHHB72eh2NT:mvf22SsaNYfdPBldt6+dBcjHWbb

Score

10^/10

quasar office04 discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.12:4782

Mutex

0372494a-0bed-4fef-b80b-1e5a15a502c1

Attributes

encryption_key
C79910CC46FB1EA158892672F174AE58510A5B0F
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/1620-1-0x0000000000E30000-0x0000000001154000-memory.dmp	family_quasar
behavioral1/files/0x000800000001660e-6.dat	family_quasar
behavioral1/memory/2664-9-0x0000000000C80000-0x0000000000FA4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2664	Client.exe

Browser Information Discovery 1 TTPs
Enumerate browser information.
discovery

Browser Information Discovery
T1217

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
2164	schtasks.exe
2264	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2916	chrome.exe
2916	chrome.exe

Suspicious use of AdjustPrivilegeToken 12 IoCs

description	pid	Process
Token: SeDebugPrivilege	1620	Client-built.exe
Token: SeDebugPrivilege	2664	Client.exe
Token: SeShutdownPrivilege	2916	chrome.exe
Token: SeShutdownPrivilege	2916	chrome.exe
Token: SeShutdownPrivilege	2916	chrome.exe
Token: SeShutdownPrivilege	2916	chrome.exe
Token: SeShutdownPrivilege	2916	chrome.exe
Token: SeShutdownPrivilege	2916	chrome.exe
Token: SeShutdownPrivilege	2916	chrome.exe
Token: SeShutdownPrivilege	2916	chrome.exe
Token: SeShutdownPrivilege	2916	chrome.exe
Token: SeShutdownPrivilege	2916	chrome.exe

Suspicious use of FindShellTrayWindow 34 IoCs

pid	Process
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe

Suspicious use of SendNotifyMessage 32 IoCs

pid	Process
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe
2916	chrome.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2664	Client.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 1620 wrote to memory of 2164	1620	Client-built.exe	30
PID 1620 wrote to memory of 2164	1620	Client-built.exe	30
PID 1620 wrote to memory of 2164	1620	Client-built.exe	30
PID 1620 wrote to memory of 2664	1620	Client-built.exe	32
PID 1620 wrote to memory of 2664	1620	Client-built.exe	32
PID 1620 wrote to memory of 2664	1620	Client-built.exe	32
PID 2664 wrote to memory of 2264	2664	Client.exe	33
PID 2664 wrote to memory of 2264	2664	Client.exe	33
PID 2664 wrote to memory of 2264	2664	Client.exe	33
PID 2916 wrote to memory of 1836	2916	chrome.exe	37
PID 2916 wrote to memory of 1836	2916	chrome.exe	37
PID 2916 wrote to memory of 1836	2916	chrome.exe	37
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 2992	2916	chrome.exe	39
PID 2916 wrote to memory of 3012	2916	chrome.exe	40
PID 2916 wrote to memory of 3012	2916	chrome.exe	40
PID 2916 wrote to memory of 3012	2916	chrome.exe	40
PID 2916 wrote to memory of 1884	2916	chrome.exe	41
PID 2916 wrote to memory of 1884	2916	chrome.exe	41
PID 2916 wrote to memory of 1884	2916	chrome.exe	41
PID 2916 wrote to memory of 1884	2916	chrome.exe	41
PID 2916 wrote to memory of 1884	2916	chrome.exe	41
PID 2916 wrote to memory of 1884	2916	chrome.exe	41
PID 2916 wrote to memory of 1884	2916	chrome.exe	41
PID 2916 wrote to memory of 1884	2916	chrome.exe	41
PID 2916 wrote to memory of 1884	2916	chrome.exe	41
PID 2916 wrote to memory of 1884	2916	chrome.exe	41

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:1620
- 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:2164
- 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 SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2664
- - 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:2264

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:2916
- 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,0x7fef1709758,0x7fef1709768,0x7fef1709778
  2⤵
  PID:1836
- 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=1144 --field-trial-handle=1172,i,10698335715305616795,1825370768933573617,131072 /prefetch:2
  2⤵
  PID:2992
- 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=1508 --field-trial-handle=1172,i,10698335715305616795,1825370768933573617,131072 /prefetch:8
  2⤵
  PID:3012
- 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=1540 --field-trial-handle=1172,i,10698335715305616795,1825370768933573617,131072 /prefetch:8
  2⤵
  PID:1884
- 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=2256 --field-trial-handle=1172,i,10698335715305616795,1825370768933573617,131072 /prefetch:1
  2⤵
  PID:2344
- 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=2264 --field-trial-handle=1172,i,10698335715305616795,1825370768933573617,131072 /prefetch:1
  2⤵
  PID:1068
- 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=1456 --field-trial-handle=1172,i,10698335715305616795,1825370768933573617,131072 /prefetch:2
  2⤵
  PID:2564
- 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=1272 --field-trial-handle=1172,i,10698335715305616795,1825370768933573617,131072 /prefetch:1
  2⤵
  PID:1112
- 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=3652 --field-trial-handle=1172,i,10698335715305616795,1825370768933573617,131072 /prefetch:8
  2⤵
  PID:772

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:1200

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x0
1⤵
PID:3048

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x1
1⤵
PID:2728

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\GCM Store\Encryption\000006.dbtmp

Filesize
16B

MD5
aefd77f47fb84fae5ea194496b44c67a

SHA1
dcfbb6a5b8d05662c4858664f81693bb7f803b82

SHA256
4166bf17b2da789b0d0cc5c74203041d98005f5d4ef88c27e8281e00148cd611

SHA512
b733d502138821948267a8b27401d7c0751e590e1298fda1428e663ccd02f55d0d2446ff4bc265bdcdc61f952d13c01524a5341bc86afc3c2cde1d8589b2e1c3

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\Preferences

Filesize
5KB

MD5
11c75f94f1ac1180e4ba568eb8892df7

SHA1
6948af35c525c3961fdc684f24ce04abfadf0b54

SHA256
2e3536ce7b5630b7bf2e8086bffe98fcbde3a9a12a43420ba984f1fd919f2f3e

SHA512
efcfea6a6c5f76bf99fe8e30cefcb98a7aecff1bda16918e79a005af24a011d6f3b845550d2f1741d6878eb12d03132c0a185656e7c07a08474affd9891e6533

Download Submit
C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Sync Data\LevelDB\000007.dbtmp

Filesize
16B

MD5
18e723571b00fb1694a3bad6c78e4054

SHA1
afcc0ef32d46fe59e0483f9a3c891d3034d12f32

SHA256
8af72f43857550b01eab1019335772b367a17a9884a7a759fdf4fe6f272b90aa

SHA512
43bb0af7d3984012d2d67ca6b71f0201e5b948e6fe26a899641c4c6f066c59906d468ddf7f1df5ea5fa33c2bc5ea8219c0f2c82e0a5c365ad7581b898a8859e2

Download Submit
C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Local State

Filesize
345KB

MD5
3804eda069280076901e9185f1058b1b

SHA1
20a97d512c5b6d0600f997779a32f99dd6cb0037

SHA256
09fa8467a1810b1853d00fdfbde01cb9c06741a43a63fb4ba2afabda0da57290

SHA512
7f6e1d4b3af59b0c75f4b800a11aa6ae0e99a5d16b93e51133774c0f3f6a1604f4323ec944808fdede32de17bf765ea725a3271485a17dff857822b3ec3451f4

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

Filesize
3.1MB

MD5
9c5ec5683c91176f1146cbc9b427e518

SHA1
2eccfa9607f1a9023079c4f88aa72b5a552bed70

SHA256
c6f8be78988d98bbc1f083b60acec86fed6259515277bc74b1eb138d1c151c82

SHA512
5aa2bc8d741b10e1d94431db71e69d6d19f1ca52cafc3580c2efcae45c82d74932b42a969a9ef69973aaa799809cef648477fae5356f456953d29335fe854fcc

Download Submit
memory/1620-1-0x0000000000E30000-0x0000000001154000-memory.dmp

Filesize
3.1MB

Download
memory/1620-2-0x000007FEF58F0000-0x000007FEF62DC000-memory.dmp

Filesize
9.9MB

Download
memory/1620-0-0x000007FEF58F3000-0x000007FEF58F4000-memory.dmp

Filesize
4KB

Download
memory/1620-10-0x000007FEF58F0000-0x000007FEF62DC000-memory.dmp

Filesize
9.9MB

Download
memory/2664-8-0x000007FEF58F0000-0x000007FEF62DC000-memory.dmp

Filesize
9.9MB

Download
memory/2664-12-0x000007FEF58F0000-0x000007FEF62DC000-memory.dmp

Filesize
9.9MB

Download
memory/2664-11-0x000007FEF58F0000-0x000007FEF62DC000-memory.dmp

Filesize
9.9MB

Download
memory/2664-9-0x0000000000C80000-0x0000000000FA4000-memory.dmp

Filesize
3.1MB

Download
memory/2664-102-0x000007FEF58F0000-0x000007FEF62DC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

Errors

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads