quasar | 27597ae07e0f769e545f437cc78c02808837d7304cecb67eca8a710056ee342d

Analysis

max time kernel
147s
max time network
143s
platform
windows10-2004_x64
resource
win10v2004-20240704-en
resource tags

arch:x64arch:x86image:win10v2004-20240704-enlocale:en-usos:windows10-2004-x64system
submitted
05/07/2024, 22:54

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General

Target
Client-built.exe
Size 3.1MB
Sample240705-2vwgssyaql
SHA256 27597ae07e0f769e545f437cc78c02808837d7304cecb67eca8a710056ee342d
MD5 c236aa3dde0f431a28113d3327216b44
SHA1 85e8fae8228df53f1696a3de5c58183359988d73
SHA512 39d44d4fbf8d227945864646c2549b23206ffe4bbbdfd84c785de871539f9c9f3a9106dbf7ed2af0f9206702e6389af5edbebf8ae4ce28e8e451c9fdddb1fda0
SSDEEP 49152:2vyI22SsaNYfdPBldt698dBcjHVdat5rGSk/S5oGdV3THHB72eh2NT:2vf22SsaNYfdPBldt6+dBcjHzax
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.68.64:4782

Mutex

a25ed66f-aef9-4e35-a88d-cb89a8cb12ef

Attributes

encryption_key
3CC636A000067DDB07BB0639A8376FEE744BFD36
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 payload 2 IoCs

resource	yara_rule
behavioral2/memory/4348-1-0x0000000000D10000-0x0000000001034000-memory.dmp	family_quasar
behavioral2/files/0x00080000000234a6-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1876	Client.exe

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	msedge.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemManufacturer	msedge.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemProductName	msedge.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
2040	schtasks.exe
1720	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1720	msedge.exe
1720	msedge.exe
1172	msedge.exe
1172	msedge.exe

Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary 2 IoCs

pid	Process
1172	msedge.exe
1172	msedge.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4348	Client-built.exe
Token: SeDebugPrivilege	1876	Client.exe

Suspicious use of FindShellTrayWindow 26 IoCs

pid	Process
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe

Suspicious use of SendNotifyMessage 24 IoCs

pid	Process
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe
1172	msedge.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1876	Client.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 4348 wrote to memory of 2040	4348	Client-built.exe	85
PID 4348 wrote to memory of 2040	4348	Client-built.exe	85
PID 4348 wrote to memory of 1876	4348	Client-built.exe	87
PID 4348 wrote to memory of 1876	4348	Client-built.exe	87
PID 1876 wrote to memory of 1720	1876	Client.exe	88
PID 1876 wrote to memory of 1720	1876	Client.exe	88
PID 1172 wrote to memory of 5068	1172	msedge.exe	103
PID 1172 wrote to memory of 5068	1172	msedge.exe	103
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 4680	1172	msedge.exe	104
PID 1172 wrote to memory of 1720	1172	msedge.exe	105
PID 1172 wrote to memory of 1720	1172	msedge.exe	105
PID 1172 wrote to memory of 216	1172	msedge.exe	106
PID 1172 wrote to memory of 216	1172	msedge.exe	106
PID 1172 wrote to memory of 216	1172	msedge.exe	106
PID 1172 wrote to memory of 216	1172	msedge.exe	106
PID 1172 wrote to memory of 216	1172	msedge.exe	106
PID 1172 wrote to memory of 216	1172	msedge.exe	106
PID 1172 wrote to memory of 216	1172	msedge.exe	106
PID 1172 wrote to memory of 216	1172	msedge.exe	106
PID 1172 wrote to memory of 216	1172	msedge.exe	106
PID 1172 wrote to memory of 216	1172	msedge.exe	106
PID 1172 wrote to memory of 216	1172	msedge.exe	106
PID 1172 wrote to memory of 216	1172	msedge.exe	106
PID 1172 wrote to memory of 216	1172	msedge.exe	106
PID 1172 wrote to memory of 216	1172	msedge.exe	106

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:4348
- 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:2040
- 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:1876
- - 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:1720

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:3540

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --single-argument http://client/
1⤵
- Enumerates system info in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1172
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=crashpad-handler "--user-data-dir=C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data" /prefetch:7 --monitor-self-annotation=ptype=crashpad-handler "--database=C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Crashpad" "--metrics-dir=C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data" --annotation=IsOfficialBuild=1 --annotation=channel= --annotation=chromium-version=92.0.4515.131 "--annotation=exe=C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --annotation=plat=Win64 "--annotation=prod=Microsoft Edge" --annotation=ver=92.0.902.67 --initial-client-data=0x11c,0x120,0x124,0xf8,0x128,0x7ffeb61c46f8,0x7ffeb61c4708,0x7ffeb61c4718
  2⤵
  PID:5068
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=gpu-process --field-trial-handle=2036,11249374686941539438,10597450553875426899,131072 --gpu-preferences=UAAAAAAAAADgAAAQAAAAAAAAAAAAAAAAAABgAAAAAAAwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAHgAAAAAAAAAeAAAAAAAAAAoAAAABAAAACAAAAAAAAAAKAAAAAAAAAAwAAAAAAAAADgAAAAAAAAAEAAAAAAAAAAAAAAADQAAABAAAAAAAAAAAQAAAA0AAAAQAAAAAAAAAAQAAAANAAAAEAAAAAAAAAAHAAAADQAAAAgAAAAAAAAACAAAAAAAAAA= --mojo-platform-channel-handle=2052 /prefetch:2
  2⤵
  PID:4680
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=network.mojom.NetworkService --field-trial-handle=2036,11249374686941539438,10597450553875426899,131072 --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=2152 /prefetch:3
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:1720
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=storage.mojom.StorageService --field-trial-handle=2036,11249374686941539438,10597450553875426899,131072 --lang=en-US --service-sandbox-type=utility --mojo-platform-channel-handle=2636 /prefetch:8
  2⤵
  PID:216
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=2036,11249374686941539438,10597450553875426899,131072 --lang=en-US --disable-client-side-phishing-detection --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=6 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=3312 /prefetch:1
  2⤵
  PID:4844
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=2036,11249374686941539438,10597450553875426899,131072 --lang=en-US --disable-client-side-phishing-detection --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=5 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=3348 /prefetch:1
  2⤵
  PID:2592

C:\Windows\System32\CompPkgSrv.exe
C:\Windows\System32\CompPkgSrv.exe -Embedding
1⤵
PID:4396

C:\Windows\System32\CompPkgSrv.exe
C:\Windows\System32\CompPkgSrv.exe -Embedding
1⤵
PID:5052

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

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

settings.dat

Path C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Crashpad\settings.dat
Size 152B
SHA256 c0e69c9f7453ef905de11f65d69b66cf8a5a2d8e42b7f296fa8dfde5c25abc79
MD5 f060e9a30a0dde4f5e3e80ae94cc7e8e
SHA1 3c0cc8c3a62c00d7210bb2c8f3748aec89009d17
SHA512 af97b8775922a2689d391d75defff3afe92842b8ab0bba5ddaa66351f633da83f160522aa39f6c243cb5e8ea543000f06939318bc52cb535103afc6c33e16bc6
MD5 SHA1 SHA512

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settings.dat

Path C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Crashpad\settings.dat
Size 152B
SHA256 d32983bba248ff7a82cc936342414b06686608013d84ec5c75614e06a9685cfe
MD5 a27d8876d0de41d0d8ddfdc4f6fd4b15
SHA1 11f126f8b8bb7b63217f3525c20080f9e969eff3
SHA512 8298c2435729f5f34bba5b82f31777c07f830076dd7087f07aab4337e679251dc2cfe276aa89a0131755fe946f05e6061ef9080e0fbe120e6c88cf9f3265689c
MD5 SHA1 SHA512

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Preferences

Path C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Preferences
Size 6KB
SHA256 6e5005d4bbae3cfac11994f71a8029960ff981ac3cb303174b90e3238b9e8066
MD5 21b428d9d9acc3bb2925de4823442d0c
SHA1 66e10b468d6e9ecac26d171133591d61771c1061
SHA512 f1b011ad8d3221376675477dee90f7daafbb8a159804b61dc9f205cc8dbf7d329b823d5369d62061567181573c517e78d2550c0c52bb41fa903f82eecd05414e
SSDEEP 96:nBkt01ewwpvWMoiVmdeHe+7+UWQyV+VDCziEwb:nBk6cwGWMXh+ro
MD5 SHA1 SHA512 SSDEEP

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Preferences

Path C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Preferences
Size 6KB
SHA256 bc5e383cb578b5a586cdcb6adf693964874c0f0df0e6eafe3abea7fb1b3f5d17
MD5 a4eff5988cb40bb24d81b292820996d3
SHA1 c6c9e29a8da0a5a51e00b55d5426c349cf3f5d8e
SHA512 2e667812b006df046617b12dc5fbb07302c53d5d6d35e4595b1efebba2500ec48e1dab557bf3497561541b4a718a3ecd47333f4b7743221de826e5859a1091ef
SSDEEP 96:nBkC01eQwpvWMoiVmdeHe/lqyWQyV+VDCAiEwb:nBk/cQGWMXSqlV
MD5 SHA1 SHA512 SSDEEP

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Local State

Path C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Local State
Size 11KB
SHA256 777ef9b1b146facbf8b5e3a454beb14ecaabd4604aaadaf3877c4480ed08f87d
MD5 e89ef0799f0ae4ede035ee75ca98abe0
SHA1 9ad16d8472d78646b5a81eb0146c35da91869adc
SHA512 733e727f711a1aa4c10e6d9d616caf4c2f01211cff779f3281ade026e609195b4e475639ac52236e4732ab5d78183f8eea000673da45c600c3dc99fd25c77f50
SSDEEP 192:JoCL/Pgu90RZj8Sr6FA4ZiIxuERzA83h09RZxAexupube2RUAboJQyuSB6VD7PGF:19iIxuERzA83h09RZxYiUJQyuCF
MD5 SHA1 SHA512 SSDEEP

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data_1

Path C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\ShaderCache\GPUCache\data_1
Size 264KB
SHA256 b1e963d702392fb7224786e7d56d43973e9b9efd1b89c17814d7c558ffc0cdec
MD5 f50f89a0a91564d0b8a211f8921aa7de
SHA1 112403a17dd69d5b9018b8cede023cb3b54eab7d
SHA512 bf8cda48cf1ec4e73f0dd1d4fa5562af1836120214edb74957430cd3e4a2783e801fa3f4ed2afb375257caeed4abe958265237d6e0aacf35a9ede7a2e8898d58
SSDEEP 3:MsEllllkEthXllkl2zE:/M/xT02z
MD5 SHA1 SHA512 SSDEEP

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Client.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Size 3.1MB
SHA256 27597ae07e0f769e545f437cc78c02808837d7304cecb67eca8a710056ee342d
MD5 c236aa3dde0f431a28113d3327216b44
SHA1 85e8fae8228df53f1696a3de5c58183359988d73
SHA512 39d44d4fbf8d227945864646c2549b23206ffe4bbbdfd84c785de871539f9c9f3a9106dbf7ed2af0f9206702e6389af5edbebf8ae4ce28e8e451c9fdddb1fda0
SSDEEP 49152:2vyI22SsaNYfdPBldt698dBcjHVdat5rGSk/S5oGdV3THHB72eh2NT:2vf22SsaNYfdPBldt6+dBcjHzax
MD5 SHA1 SHA512 SSDEEP

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memory/1876-13-0x000000001BBD0000-0x000000001BC82000-memory.dmp

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memory/1876-14-0x00007FFEC0650000-0x00007FFEC1111000-memory.dmp

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memory/1876-15-0x000000001C500000-0x000000001CA28000-memory.dmp

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memory/1876-12-0x000000001B2A0000-0x000000001B2F0000-memory.dmp

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memory/1876-11-0x00007FFEC0650000-0x00007FFEC1111000-memory.dmp

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memory/1876-9-0x00007FFEC0650000-0x00007FFEC1111000-memory.dmp

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memory/4348-0-0x00007FFEC0653000-0x00007FFEC0655000-memory.dmp

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memory/4348-10-0x00007FFEC0650000-0x00007FFEC1111000-memory.dmp

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memory/4348-2-0x00007FFEC0650000-0x00007FFEC1111000-memory.dmp

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memory/4348-1-0x0000000000D10000-0x0000000001034000-memory.dmp

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