quasar | 76de148ac9b1a4f05355202bc129130af14f507a9de7662015227b911cd73941

Analysis

max time kernel
151s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
06/06/2024, 17:27

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General

Target
Fatal - Free.exe
Size 3.1MB
Sample240606-v1qeeaab94
SHA256 76de148ac9b1a4f05355202bc129130af14f507a9de7662015227b911cd73941
MD5 c0de0f57c69ae9b5aa1ce38896e14fd0
SHA1 e89157053a1af663cc465069ba6fc069813b2753
SHA512 9389f777a1d8c864fbe25f92c0e79d87918cd8097b0cf3000534b82c5b8860cec5d81e4179a5ee90c4e43b997af2c1aef6447187a2f9570cd9bb256a231c2141
SSDEEP 49152:Wvkt62XlaSFNWPjljiFa2RoUYIvz7zQhoGd1gTHHB72eh2NT:Wv462XlaSFNWPjljiFXRoUYIvz7zi
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.3.37:4782

Mutex

f92406d0-04ae-497d-aa31-b25c24b863d2

Attributes

encryption_key
FD81B8715CDDADAE86DD8D24006A755C171092F8
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Fatal - Free
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/2388-1-0x0000000000C40000-0x0000000000F64000-memory.dmp	family_quasar
behavioral2/files/0x0008000000023260-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3828	Client.exe

Checks SCSI registry key(s) 3 TTPs 3 IoCs

SCSI information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000	taskmgr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\Properties\{b725f130-47ef-101a-a5f1-02608c9eebac}\000A	taskmgr.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\FriendlyName	taskmgr.exe

Creates scheduled task(s) 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
1760	schtasks.exe
5064	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
820	taskmgr.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	820	taskmgr.exe
Token: SeSystemProfilePrivilege	820	taskmgr.exe
Token: SeCreateGlobalPrivilege	820	taskmgr.exe
Token: SeDebugPrivilege	2388	Fatal - Free.exe
Token: SeDebugPrivilege	3828	Client.exe

Suspicious use of FindShellTrayWindow 64 IoCs

pid	Process
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe

Suspicious use of SendNotifyMessage 64 IoCs

pid	Process
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe
820	taskmgr.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3828	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2388 wrote to memory of 5064	2388	Fatal - Free.exe	93
PID 2388 wrote to memory of 5064	2388	Fatal - Free.exe	93
PID 2388 wrote to memory of 3828	2388	Fatal - Free.exe	95
PID 2388 wrote to memory of 3828	2388	Fatal - Free.exe	95
PID 3828 wrote to memory of 1760	3828	Client.exe	96
PID 3828 wrote to memory of 1760	3828	Client.exe	96

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\Fatal - Free.exe
"C:\Users\Admin\AppData\Local\Temp\Fatal - Free.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2388
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Fatal - Free" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:5064
- 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:3828
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Fatal - Free" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:1760

C:\Windows\system32\taskmgr.exe
"C:\Windows\system32\taskmgr.exe" /4
1⤵
- Checks SCSI registry key(s)
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
PID:820

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1312 --field-trial-handle=2280,i,4114443225282860369,4764091921472631035,262144 --variations-seed-version /prefetch:8
1⤵
PID:4672

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

Client.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Size 3.1MB
SHA256 76de148ac9b1a4f05355202bc129130af14f507a9de7662015227b911cd73941
MD5 c0de0f57c69ae9b5aa1ce38896e14fd0
SHA1 e89157053a1af663cc465069ba6fc069813b2753
SHA512 9389f777a1d8c864fbe25f92c0e79d87918cd8097b0cf3000534b82c5b8860cec5d81e4179a5ee90c4e43b997af2c1aef6447187a2f9570cd9bb256a231c2141
SSDEEP 49152:Wvkt62XlaSFNWPjljiFa2RoUYIvz7zQhoGd1gTHHB72eh2NT:Wv462XlaSFNWPjljiFXRoUYIvz7zi
MD5 SHA1 SHA512 SSDEEP

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memory/820-17-0x0000026C16A30000-0x0000026C16A31000-memory.dmp

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memory/820-20-0x0000026C16A30000-0x0000026C16A31000-memory.dmp

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memory/820-16-0x0000026C16A30000-0x0000026C16A31000-memory.dmp

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memory/820-11-0x0000026C16A30000-0x0000026C16A31000-memory.dmp

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memory/820-18-0x0000026C16A30000-0x0000026C16A31000-memory.dmp

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memory/820-10-0x0000026C16A30000-0x0000026C16A31000-memory.dmp

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memory/820-19-0x0000026C16A30000-0x0000026C16A31000-memory.dmp

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memory/820-21-0x0000026C16A30000-0x0000026C16A31000-memory.dmp

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memory/820-22-0x0000026C16A30000-0x0000026C16A31000-memory.dmp

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memory/820-9-0x0000026C16A30000-0x0000026C16A31000-memory.dmp

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memory/2388-0-0x00007FFD3FDC3000-0x00007FFD3FDC5000-memory.dmp

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memory/2388-2-0x00007FFD3FDC0000-0x00007FFD40881000-memory.dmp

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memory/2388-12-0x00007FFD3FDC0000-0x00007FFD40881000-memory.dmp

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memory/2388-1-0x0000000000C40000-0x0000000000F64000-memory.dmp

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memory/3828-23-0x000000001BA90000-0x000000001BAE0000-memory.dmp

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memory/3828-24-0x000000001DA50000-0x000000001DB02000-memory.dmp

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