quasar | 8cb80c88fea397c4b823bbe69891809fefb8fe98224a1552ac0cced93ed3437c

General

Target

Client-built.exe
Size

3.1MB
MD5

d5745aeed95df53334f3e3de9808b874
SHA1

88877da94ce9c4121d5f5eb3fa9edb9fdf3a80ce
SHA256

8cb80c88fea397c4b823bbe69891809fefb8fe98224a1552ac0cced93ed3437c
SHA512

fe9512143d7020dadb5968025e3198d11dcebe66a0407c79ba27dc09a7459247c7265988a102749bed44c6b79e4b797a28268cbe2da03a58e47d2b19224ad413
SSDEEP

49152:0v/t62XlaSFNWPjljiFa2RoUYI+ZyP+vEzTHHB72eh2NT:0vV62XlaSFNWPjljiFXRoUYI+Zi

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

181.215.176.73:59955

Mutex

efc7c4e1-67b9-4193-a637-9063d2f6052c

Attributes

encryption_key
01A024E271E79DC5F555EC503C0E2AB6090246F2
install_name
repl.exe
log_directory
Logs
reconnect_delay
3000
startup_key
replstart
subdirectory
repl

Signatures

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

Quasar payload 4 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1552-54-0x0000000000030000-0x000000000034A000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\repl\repl.exe	family_quasar
C:\Users\Admin\AppData\Roaming\repl\repl.exe	family_quasar
behavioral1/memory/1716-61-0x0000000000E40000-0x000000000115A000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

repl.exe

pid process

1716 repl.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exeschtasks.exe

pid process

668 schtasks.exe
1820 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exerepl.exe

description pid process

Token: SeDebugPrivilege 1552 Client-built.exe
Token: SeDebugPrivilege 1716 repl.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

repl.exe

pid process

1716 repl.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

repl.exe

pid process

1716 repl.exe

pid	process
1716	repl.exe

pid	process
668	schtasks.exe
1820	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	1552	Client-built.exe
Token: SeDebugPrivilege	1716	repl.exe

pid	process
1716	repl.exe

pid	process
1716	repl.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Client-built.exerepl.exe

description	pid	process	target process
PID 1552 wrote to memory of 668	1552	Client-built.exe	schtasks.exe
PID 1552 wrote to memory of 668	1552	Client-built.exe	schtasks.exe
PID 1552 wrote to memory of 668	1552	Client-built.exe	schtasks.exe
PID 1552 wrote to memory of 1716	1552	Client-built.exe	repl.exe
PID 1552 wrote to memory of 1716	1552	Client-built.exe	repl.exe
PID 1552 wrote to memory of 1716	1552	Client-built.exe	repl.exe
PID 1716 wrote to memory of 1820	1716	repl.exe	schtasks.exe
PID 1716 wrote to memory of 1820	1716	repl.exe	schtasks.exe
PID 1716 wrote to memory of 1820	1716	repl.exe	schtasks.exe

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:1552

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "replstart" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\repl\repl.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:668

C:\Users\Admin\AppData\Roaming\repl\repl.exe
"C:\Users\Admin\AppData\Roaming\repl\repl.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1716

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "replstart" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\repl\repl.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:1820

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Query Registry

1

T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\repl\repl.exe
Filesize
3.1MB

MD5
d5745aeed95df53334f3e3de9808b874

SHA1
88877da94ce9c4121d5f5eb3fa9edb9fdf3a80ce

SHA256
8cb80c88fea397c4b823bbe69891809fefb8fe98224a1552ac0cced93ed3437c

SHA512
fe9512143d7020dadb5968025e3198d11dcebe66a0407c79ba27dc09a7459247c7265988a102749bed44c6b79e4b797a28268cbe2da03a58e47d2b19224ad413

Download Submit
C:\Users\Admin\AppData\Roaming\repl\repl.exe
Filesize
3.1MB

MD5
d5745aeed95df53334f3e3de9808b874

SHA1
88877da94ce9c4121d5f5eb3fa9edb9fdf3a80ce

SHA256
8cb80c88fea397c4b823bbe69891809fefb8fe98224a1552ac0cced93ed3437c

SHA512
fe9512143d7020dadb5968025e3198d11dcebe66a0407c79ba27dc09a7459247c7265988a102749bed44c6b79e4b797a28268cbe2da03a58e47d2b19224ad413

Download Submit
memory/1552-54-0x0000000000030000-0x000000000034A000-memory.dmp

Filesize
3.1MB

Download
memory/1552-55-0x000000001AB70000-0x000000001ABF0000-memory.dmp

Filesize
512KB

Download
memory/1716-61-0x0000000000E40000-0x000000000115A000-memory.dmp

Filesize
3.1MB

Download
memory/1716-62-0x000000001B210000-0x000000001B290000-memory.dmp

Filesize
512KB

Download
memory/1716-63-0x000000001B210000-0x000000001B290000-memory.dmp

Filesize
512KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads