quasar | db2dab1737a1c4fb319facfc5762d11e1a898ebc52e2d587123273aceab819eb

Analysis

max time kernel
149s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20260513-en
resource tags

arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
03/08/2026, 15:05

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General

Target
Client-built.exe
Size 3.1MB
Sample260803-sf66baseka
SHA256 db2dab1737a1c4fb319facfc5762d11e1a898ebc52e2d587123273aceab819eb
MD5 126cdcfa9995899e355565b0fe5bd338
SHA1 2511d737fe2a321a8c94d8a234ec26a1a309c18b
SHA512 5f67d3b190cf1f6376ddaacef16fe9e6f6d42df978d99f5c00afcabd102f025dfbf69337a0700b6de2c60353216e3bb384aea7478290d90a5e2e3e91ac1c77f4
SSDEEP 49152:PvbI22SsaNYfdPBldt698dBcjHEC2xNESE1k/ipLoGdIO7XTHHB72eh2NT:Pvk22SsaNYfdPBldt6+dBcjHixY54
TLSH
T150E55B143BF85F23E1BBE27395B0041667F0EC2AB3A3EB1B1191677E1C53B5059426AB
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

office04 discovery execution quasar spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

172.111.134.94:4782

Mutex

bce5a84f-00ac-4478-9b5f-f88136388035

Attributes

encryption_key
4007C7F5BE6F76DE717640B65A04C8074D917CE5
install_name
Client.exe
key_salt
bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

Family: Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar

Quasar payload 1 IoCs

resource	yara_rule
behavioral1/memory/1388-0-0x0000000000240000-0x0000000000564000-memory.dmp	family_quasar

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	Client-built.exe

Looks up external IP address via web service 1 TTPs 2 IoCs

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

discovery

Internet Connection Discovery

T1016.001

flow	ioc
15	api.ipify.org
16	api.ipify.org

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

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
2348	cmd.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
2352	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2352	PING.EXE

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1388	Client-built.exe

Suspicious use of FindShellTrayWindow 3 IoCs

pid	Process
1388	Client-built.exe
1388	Client-built.exe
1388	Client-built.exe

Suspicious use of SendNotifyMessage 3 IoCs

pid	Process
1388	Client-built.exe
1388	Client-built.exe
1388	Client-built.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1388 wrote to memory of 2348	1388	Client-built.exe	95
PID 2348 wrote to memory of 3540	2348	cmd.exe	97
PID 2348 wrote to memory of 2352	2348	cmd.exe	98

C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1388
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\8Y6dKHLdGSiq.bat" "
  2⤵
  - Executes a command shell one-liner
  - Suspicious use of WriteProcessMemory
  PID:2348
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:3540
- - C:\Windows\system32\PING.EXE
    ping -n 10 localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:2352

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Windows Command Shell

T1059.003

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

8Y6dKHLdGSiq.bat

Path C:\Users\Admin\AppData\Local\Temp\8Y6dKHLdGSiq.bat
Size 213B
SHA256 a21cce55534000888276c1619bfbd487986a532573ba07d4b23e4f7031f01037
MD5 cf522c3dc0fa335c6c7745ce1e41a4f9
SHA1 713ffa221a0ad109815b53570152169deedef501
SHA512 039a9ce6ebc57f42def77a7256abefba40945071c800806a845ca06d136325a70922e2562dd73166bf8be84615c1f7a65c889470c5bd81e4d5e3a809285e99d0
TLSH
T144D023415341C55D0700458E7CED938CD0690CEB6F09BF714515CC9C438745DA6577C3
MD5 SHA1 SHA512 TLSH

Submit Download

memory/1388-0-0x0000000000240000-0x0000000000564000-memory.dmp

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memory/1388-1-0x000000001B470000-0x000000001B480000-memory.dmp

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memory/1388-2-0x000000001C6D0000-0x000000001C720000-memory.dmp

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memory/1388-3-0x000000001C7E0000-0x000000001C892000-memory.dmp

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memory/1388-4-0x000000001B470000-0x000000001B480000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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