quasar | c8ccabab4b9bd78e4ddbd6e007a4d5472b90713eee4aff89cddb4f86d95b8884

Analysis

max time kernel
144s
max time network
150s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
09-02-2025 19:15

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General

Target

Client-built.exe
Size

3.1MB
MD5

528aac487e4cb55751f89428aa946f35
SHA1

1d4a43e2df64526a88ba7a1e3abc4059d02bb6d2
SHA256

c8ccabab4b9bd78e4ddbd6e007a4d5472b90713eee4aff89cddb4f86d95b8884
SHA512

c7d39ecf98a4dd2ba0cd7341ece289934e5e658e1006c4d7cb3713da4ca0bae6feb5a4e544c34c265673b5ea211c877f5b23b2dad15e89cf8502b695ba2742b9
SSDEEP

49152:mv2I22SsaNYfdPBldt698dBcjHyxRcmCZLoed3UfyTHHB72eh2NT:mvb22SsaNYfdPBldt6+dBcjHyxRGR

Score

10^/10

quasar office01 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office01

sabaf-38910.portmap.host:38910

Mutex

f7356d60-951e-494a-a901-2e12bb084129

Attributes

encryption_key
5C7AC20AEB149D8BC06141FCF79866AD6E3847AD
install_name
RuntimeBroker.exe
log_directory
Logs
reconnect_delay
3000
startup_key
RunTimeBroker
subdirectory
System32

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/1992-1-0x0000000000840000-0x0000000000B64000-memory.dmp	family_quasar
behavioral1/files/0x0009000000016c58-6.dat	family_quasar
behavioral1/memory/2992-9-0x00000000000F0000-0x0000000000414000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2992	RuntimeBroker.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File created	C:\Windows\system32\System32\RuntimeBroker.exe	Client-built.exe
File opened for modification	C:\Windows\system32\System32\RuntimeBroker.exe	Client-built.exe
File opened for modification	C:\Windows\system32\System32	Client-built.exe
File opened for modification	C:\Windows\system32\System32\RuntimeBroker.exe	RuntimeBroker.exe
File opened for modification	C:\Windows\system32\System32	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1992	Client-built.exe
Token: SeDebugPrivilege	2992	RuntimeBroker.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2992	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1992 wrote to memory of 2992	1992	Client-built.exe	30
PID 1992 wrote to memory of 2992	1992	Client-built.exe	30
PID 1992 wrote to memory of 2992	1992	Client-built.exe	30

C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1992
- C:\Windows\system32\System32\RuntimeBroker.exe
  "C:\Windows\system32\System32\RuntimeBroker.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:2992

Network

MITRE ATT&CK Matrix

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Downloads

C:\Windows\System32\System32\RuntimeBroker.exe

Filesize
3.1MB

MD5
528aac487e4cb55751f89428aa946f35

SHA1
1d4a43e2df64526a88ba7a1e3abc4059d02bb6d2

SHA256
c8ccabab4b9bd78e4ddbd6e007a4d5472b90713eee4aff89cddb4f86d95b8884

SHA512
c7d39ecf98a4dd2ba0cd7341ece289934e5e658e1006c4d7cb3713da4ca0bae6feb5a4e544c34c265673b5ea211c877f5b23b2dad15e89cf8502b695ba2742b9

Download Submit
memory/1992-0-0x000007FEF5C13000-0x000007FEF5C14000-memory.dmp

Filesize
4KB

Download
memory/1992-1-0x0000000000840000-0x0000000000B64000-memory.dmp

Filesize
3.1MB

Download
memory/1992-2-0x000007FEF5C10000-0x000007FEF65FC000-memory.dmp

Filesize
9.9MB

Download
memory/1992-10-0x000007FEF5C10000-0x000007FEF65FC000-memory.dmp

Filesize
9.9MB

Download
memory/2992-9-0x00000000000F0000-0x0000000000414000-memory.dmp

Filesize
3.1MB

Download
memory/2992-8-0x000007FEF5C10000-0x000007FEF65FC000-memory.dmp

Filesize
9.9MB

Download
memory/2992-11-0x000007FEF5C10000-0x000007FEF65FC000-memory.dmp

Filesize
9.9MB

Download
memory/2992-12-0x000007FEF5C10000-0x000007FEF65FC000-memory.dmp

Filesize
9.9MB

Download