quasar | 018f75f18b882044109f250f19da654c0b3bd90430b318fcb03348908a189aae

Analysis

max time kernel
304s
max time network
321s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
01/06/2024, 07:37

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General

Target
loadervmp.exe
Size 409KB
Sample240601-jf54ksfa69
SHA256 018f75f18b882044109f250f19da654c0b3bd90430b318fcb03348908a189aae
MD5 14f056491baaed04872533c2d9648d46
SHA1 c48b08d0e9064f2d060f19474bb54cf3c5a25586
SHA512 c109b1a9cf40049f8958beab9cff112cb326dd719c56f6dedafda4cf3a64d3faae3912f34cbcc1ee203a0316e40b8f7016624f05a1ad6c93bbaa0bdc9dc79b08
SSDEEP 6144:rMvlpdRJjGq/ldSTTIgiGwo9W0MFMJyb7+Ye0SmxalGcqwL6Ir4H9VI:EpbJjGu/STTIwJWIJgG0jFCRsH9VI
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar seroxen persistence spyware trojan

Malware Config

Extracted

Family

quasar

Version

3.1.5

Botnet

SeroXen

panel-slave.gl.at.ply.gg:57059
panel-slave.gl.at.ply.gg:27892

Mutex

$Sxr-rpL8EItHN3pqIQQVy2

Attributes

encryption_key
ZJpQQkxTrak9Zs9tUOQW
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
SeroXen
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/2780-1-0x0000000000E30000-0x0000000000E9C000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023281-13.dat	family_quasar

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\DoSvc\ImagePath = "C:\\Windows\\System32\\svchost.exe -k NetworkService -p"	WaaSMedicAgent.exe

Executes dropped EXE 1 IoCs

pid	Process
4476	Client.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SeroXen = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\loadervmp.exe\""	loadervmp.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
39	ip-api.com

Creates scheduled task(s) 1 TTPs 3 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
220	schtasks.exe
1612	schtasks.exe
1860	SCHTASKS.exe

Modifies data under HKEY_USERS 41 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed	WaaSMedicAgent.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2780	loadervmp.exe
Token: SeDebugPrivilege	4476	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4476	Client.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2780 wrote to memory of 220	2780	loadervmp.exe	98
PID 2780 wrote to memory of 220	2780	loadervmp.exe	98
PID 2780 wrote to memory of 220	2780	loadervmp.exe	98
PID 2780 wrote to memory of 4476	2780	loadervmp.exe	100
PID 2780 wrote to memory of 4476	2780	loadervmp.exe	100
PID 2780 wrote to memory of 4476	2780	loadervmp.exe	100
PID 4476 wrote to memory of 1612	4476	Client.exe	101
PID 4476 wrote to memory of 1612	4476	Client.exe	101
PID 4476 wrote to memory of 1612	4476	Client.exe	101
PID 2780 wrote to memory of 1860	2780	loadervmp.exe	103
PID 2780 wrote to memory of 1860	2780	loadervmp.exe	103
PID 2780 wrote to memory of 1860	2780	loadervmp.exe	103

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\loadervmp.exe
"C:\Users\Admin\AppData\Local\Temp\loadervmp.exe"
1⤵
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2780
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks" /create /tn "SeroXen" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\loadervmp.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:220
- 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:4476
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "SeroXen" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:1612
- C:\Windows\SysWOW64\SCHTASKS.exe
  "SCHTASKS.exe" /create /tn "$77loadervmp.exe" /tr "'C:\Users\Admin\AppData\Local\Temp\loadervmp.exe'" /sc onlogon /rl HIGHEST
  2⤵
  - Creates scheduled task(s)
  PID:1860

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=4264 --field-trial-handle=2692,i,8678872182442199182,12502579059484928042,262144 --variations-seed-version /prefetch:8
1⤵
PID:4676

C:\Windows\System32\WaaSMedicAgent.exe
C:\Windows\System32\WaaSMedicAgent.exe 190bcd77fcf2b730eaaef46532c95b17 vz1rON6qgkml5DAGlrVk4A.0.1.0.0.0
1⤵
- Sets service image path in registry
- Modifies data under HKEY_USERS
PID:2044

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Client.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Size 409KB
SHA256 018f75f18b882044109f250f19da654c0b3bd90430b318fcb03348908a189aae
MD5 14f056491baaed04872533c2d9648d46
SHA1 c48b08d0e9064f2d060f19474bb54cf3c5a25586
SHA512 c109b1a9cf40049f8958beab9cff112cb326dd719c56f6dedafda4cf3a64d3faae3912f34cbcc1ee203a0316e40b8f7016624f05a1ad6c93bbaa0bdc9dc79b08
SSDEEP 6144:rMvlpdRJjGq/ldSTTIgiGwo9W0MFMJyb7+Ye0SmxalGcqwL6Ir4H9VI:EpbJjGu/STTIwJWIJgG0jFCRsH9VI
MD5 SHA1 SHA512 SSDEEP

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memory/2780-8-0x0000000074F70000-0x0000000075720000-memory.dmp

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memory/2780-1-0x0000000000E30000-0x0000000000E9C000-memory.dmp

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memory/2780-3-0x00000000058E0000-0x0000000005972000-memory.dmp

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memory/2780-4-0x0000000074F70000-0x0000000075720000-memory.dmp

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memory/2780-5-0x0000000074F7E000-0x0000000074F7F000-memory.dmp

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memory/2780-6-0x0000000005980000-0x00000000059E6000-memory.dmp

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memory/2780-2-0x0000000005DF0000-0x0000000006394000-memory.dmp

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memory/2780-7-0x00000000068C0000-0x00000000068D2000-memory.dmp

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memory/2780-9-0x0000000006D00000-0x0000000006D3C000-memory.dmp

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memory/2780-0-0x0000000074F7E000-0x0000000074F7F000-memory.dmp

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memory/2780-20-0x0000000074F70000-0x0000000075720000-memory.dmp

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memory/4476-16-0x0000000074F70000-0x0000000075720000-memory.dmp

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memory/4476-19-0x0000000006D20000-0x0000000006D2A000-memory.dmp

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memory/4476-15-0x0000000074F70000-0x0000000075720000-memory.dmp

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memory/4476-21-0x0000000074F70000-0x0000000075720000-memory.dmp

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memory/4476-22-0x0000000074F70000-0x0000000075720000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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