quasar | 85f453be7ee3915a11d51992cb30135849abf25006668b2b2589bc96bdca5a20

Analysis

max time kernel
150s
max time network
123s
platform
windows7_x64
resource
win7-20241023-en
resource tags

arch:x64arch:x86image:win7-20241023-enlocale:en-usos:windows7-x64system
submitted
06-02-2025 23:26

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General

Target

Client-built.exe
Size

3.2MB
MD5

9829267eb5a37773b209963bbed9e419
SHA1

5d812309f2fe6b21fc0c8f5a5b84b19d2c5df121
SHA256

85f453be7ee3915a11d51992cb30135849abf25006668b2b2589bc96bdca5a20
SHA512

77aa1134121991fae234532f6ae754aecbc55784a60e229b0128a442004103486263b243168672c6552f3ab24cbf2a4a9209e8aaf05af0b24c9b9c4bffccdcd7
SSDEEP

98304:3vj52fyaSZOrPWluWBDG5g5h5ppFUHBp:fa+5xjU

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

localhost:4782

Mutex

e6dd4e3c-69b8-4cc3-bd87-255fbec8b149

Attributes

encryption_key
3B9457A501B5D0EA09920FB91E1FFB2405E7981F
install_name
WinRAR.exe
log_directory
Logs
reconnect_delay
3000
startup_key
WinRAR
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/684-1-0x0000000001210000-0x000000000154C000-memory.dmp	family_quasar
behavioral1/files/0x0008000000016b47-6.dat	family_quasar
behavioral1/memory/3068-9-0x00000000013A0000-0x00000000016DC000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3068	WinRAR.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
2416	schtasks.exe
1028	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	684	Client-built.exe
Token: SeDebugPrivilege	3068	WinRAR.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 684 wrote to memory of 2416	684	Client-built.exe	30
PID 684 wrote to memory of 2416	684	Client-built.exe	30
PID 684 wrote to memory of 2416	684	Client-built.exe	30
PID 684 wrote to memory of 3068	684	Client-built.exe	32
PID 684 wrote to memory of 3068	684	Client-built.exe	32
PID 684 wrote to memory of 3068	684	Client-built.exe	32
PID 3068 wrote to memory of 1028	3068	WinRAR.exe	33
PID 3068 wrote to memory of 1028	3068	WinRAR.exe	33
PID 3068 wrote to memory of 1028	3068	WinRAR.exe	33

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:684
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "WinRAR" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\WinRAR.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2416
- C:\Users\Admin\AppData\Roaming\SubDir\WinRAR.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\WinRAR.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3068
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "WinRAR" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\WinRAR.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1028

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\WinRAR.exe

Filesize
3.2MB

MD5
9829267eb5a37773b209963bbed9e419

SHA1
5d812309f2fe6b21fc0c8f5a5b84b19d2c5df121

SHA256
85f453be7ee3915a11d51992cb30135849abf25006668b2b2589bc96bdca5a20

SHA512
77aa1134121991fae234532f6ae754aecbc55784a60e229b0128a442004103486263b243168672c6552f3ab24cbf2a4a9209e8aaf05af0b24c9b9c4bffccdcd7

Download Submit
memory/684-0-0x000007FEF5D13000-0x000007FEF5D14000-memory.dmp

Filesize
4KB

Download
memory/684-1-0x0000000001210000-0x000000000154C000-memory.dmp

Filesize
3.2MB

Download
memory/684-2-0x000007FEF5D10000-0x000007FEF66FC000-memory.dmp

Filesize
9.9MB

Download
memory/684-8-0x000007FEF5D10000-0x000007FEF66FC000-memory.dmp

Filesize
9.9MB

Download
memory/3068-9-0x00000000013A0000-0x00000000016DC000-memory.dmp

Filesize
3.2MB

Download
memory/3068-11-0x000007FEF5D10000-0x000007FEF66FC000-memory.dmp

Filesize
9.9MB

Download
memory/3068-10-0x000007FEF5D10000-0x000007FEF66FC000-memory.dmp

Filesize
9.9MB

Download
memory/3068-12-0x000007FEF5D10000-0x000007FEF66FC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads