quasar | 566ba756b7fc2174fc195c05d9e0a36aa706e4ce397f890488227b7d0ad4ad7c

Analysis

max time kernel
116s
max time network
119s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
15-05-2024 17:34

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General

Target

client.exe
Size

3.1MB
MD5

4a603ec4e3c5a21400eaabac7c6401c6
SHA1

23b446721eacd0b6796407ca20bd1e01355ab41f
SHA256

566ba756b7fc2174fc195c05d9e0a36aa706e4ce397f890488227b7d0ad4ad7c
SHA512

070a5dd14bce16ba58eb65f3b3143fc7890f0e34f2ed7f3a1930e3fa8454ebcf615b43c819f16f4fc494676443bd409a3a57e8fe6e8f39ab02df5ace497eaea0
SSDEEP

49152:rvrI22SsaNYfdPBldt698dBcjHLCc1J2LoGdcTHHB72eh2NT:rvU22SsaNYfdPBldt6+dBcjHLCn

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

79.132.193.215:4782

Mutex

f99ccef5-65c4-4972-adf2-fb38921cc9fc

Attributes

encryption_key
1C15E91ACCFAC60B043A1336CF6912EA8572BA83
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral3/memory/2020-1-0x0000000000880000-0x0000000000BA4000-memory.dmp	family_quasar
C:\Windows\System32\Client.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

740 Client.exe
Drops file in System32 directory 2 IoCs

Processes:

client.exe

description ioc process

File created C:\Windows\system32\Client.exe client.exe
File opened for modification C:\Windows\system32\Client.exe client.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

client.exeClient.exe

description pid process

Token: SeDebugPrivilege 2020 client.exe
Token: SeDebugPrivilege 740 Client.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid process

740 Client.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid process

740 Client.exe
Suspicious use of WriteProcessMemory 2 IoCs

Processes:

client.exe

description pid process target process

PID 2020 wrote to memory of 740 2020 client.exe Client.exe
PID 2020 wrote to memory of 740 2020 client.exe Client.exe

pid	process
740	Client.exe

description	ioc	process
File created	C:\Windows\system32\Client.exe	client.exe
File opened for modification	C:\Windows\system32\Client.exe	client.exe

description	pid	process
Token: SeDebugPrivilege	2020	client.exe
Token: SeDebugPrivilege	740	Client.exe

pid	process
740	Client.exe

pid	process
740	Client.exe

description	pid	process	target process
PID 2020 wrote to memory of 740	2020	client.exe	Client.exe
PID 2020 wrote to memory of 740	2020	client.exe	Client.exe

C:\Users\Admin\AppData\Local\Temp\client.exe
"C:\Users\Admin\AppData\Local\Temp\client.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2020

C:\Windows\system32\Client.exe
"C:\Windows\system32\Client.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
PID:740

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Client.exe.log

Filesize
1KB

MD5
baf55b95da4a601229647f25dad12878

SHA1
abc16954ebfd213733c4493fc1910164d825cac8

SHA256
ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

SHA512
24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

Download Submit
C:\Windows\System32\Client.exe

Filesize
3.1MB

MD5
4a603ec4e3c5a21400eaabac7c6401c6

SHA1
23b446721eacd0b6796407ca20bd1e01355ab41f

SHA256
566ba756b7fc2174fc195c05d9e0a36aa706e4ce397f890488227b7d0ad4ad7c

SHA512
070a5dd14bce16ba58eb65f3b3143fc7890f0e34f2ed7f3a1930e3fa8454ebcf615b43c819f16f4fc494676443bd409a3a57e8fe6e8f39ab02df5ace497eaea0

Download Submit
memory/740-10-0x00007FFB98E10000-0x00007FFB998D1000-memory.dmp

Filesize
10.8MB

Download
memory/740-11-0x00007FFB98E10000-0x00007FFB998D1000-memory.dmp

Filesize
10.8MB

Download
memory/740-12-0x000000001BCC0000-0x000000001BD10000-memory.dmp

Filesize
320KB

Download
memory/740-13-0x000000001BDD0000-0x000000001BE82000-memory.dmp

Filesize
712KB

Download
memory/740-14-0x00007FFB98E10000-0x00007FFB998D1000-memory.dmp

Filesize
10.8MB

Download
memory/2020-0-0x00007FFB98E13000-0x00007FFB98E15000-memory.dmp

Filesize
8KB

Download
memory/2020-1-0x0000000000880000-0x0000000000BA4000-memory.dmp

Filesize
3.1MB

Download
memory/2020-2-0x00007FFB98E10000-0x00007FFB998D1000-memory.dmp

Filesize
10.8MB

Download
memory/2020-9-0x00007FFB98E10000-0x00007FFB998D1000-memory.dmp

Filesize
10.8MB

Download