quasar | 48d4fde21b28f0614fdf124f83f5594bddc13292f21b775da58b017385a49b01

General

Target

Client-built.exe
Size

3.1MB
MD5

f5b93af3ee1b64dacd2bac9ba4af9b27
SHA1

1f2a038199a71a2b917dca4dff2f5fac5e840978
SHA256

48d4fde21b28f0614fdf124f83f5594bddc13292f21b775da58b017385a49b01
SHA512

83703b0f567723abe3d6b34bd419be5df3475e049ae8893993fec017da9a420cd875184c570bdffbfc0bccac662762991885dea8ebcc2af172b3aac2fb00a302
SSDEEP

49152:mv2I22SsaNYfdPBldt698dBcjHQzRJ6TbR3LoGd/oobTHHB72eh2NT:mvb22SsaNYfdPBldt6+dBcjHQzRJ6FA

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

Inversin-43597.portmap.host:43597

Mutex

80329fd2-f063-4b06-9c7e-8dbc6278c2a3

Attributes

encryption_key
744EA1A385FEBC6DA96387411B7000D77E66B075
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
java updater
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/388-1-0x0000000000D30000-0x0000000001054000-memory.dmp	family_quasar
behavioral1/files/0x000800000001876a-5.dat	family_quasar
behavioral1/memory/1660-7-0x0000000000CF0000-0x0000000001014000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid	Process
1660	Client.exe

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

System Information Discovery
T1082

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

Processes:

schtasks.exeschtasks.exe

pid	Process
868	schtasks.exe
2464	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description	pid	Process
Token: SeDebugPrivilege	388	Client-built.exe
Token: SeDebugPrivilege	1660	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid	Process
1660	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid	Process
1660	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Client-built.exeClient.exe

description	pid	Process	procid_target
PID 388 wrote to memory of 868	388	Client-built.exe	31
PID 388 wrote to memory of 868	388	Client-built.exe	31
PID 388 wrote to memory of 868	388	Client-built.exe	31
PID 388 wrote to memory of 1660	388	Client-built.exe	33
PID 388 wrote to memory of 1660	388	Client-built.exe	33
PID 388 wrote to memory of 1660	388	Client-built.exe	33
PID 1660 wrote to memory of 2464	1660	Client.exe	34
PID 1660 wrote to memory of 2464	1660	Client.exe	34
PID 1660 wrote to memory of 2464	1660	Client.exe	34

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:388
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "java updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:868
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:1660
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "java updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2464

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
3.1MB

MD5
f5b93af3ee1b64dacd2bac9ba4af9b27

SHA1
1f2a038199a71a2b917dca4dff2f5fac5e840978

SHA256
48d4fde21b28f0614fdf124f83f5594bddc13292f21b775da58b017385a49b01

SHA512
83703b0f567723abe3d6b34bd419be5df3475e049ae8893993fec017da9a420cd875184c570bdffbfc0bccac662762991885dea8ebcc2af172b3aac2fb00a302

Download Submit
memory/388-0-0x000007FEF51C3000-0x000007FEF51C4000-memory.dmp

Filesize
4KB

Download
memory/388-1-0x0000000000D30000-0x0000000001054000-memory.dmp

Filesize
3.1MB

Download
memory/388-2-0x000007FEF51C0000-0x000007FEF5BAC000-memory.dmp

Filesize
9.9MB

Download
memory/388-9-0x000007FEF51C0000-0x000007FEF5BAC000-memory.dmp

Filesize
9.9MB

Download
memory/1660-10-0x000007FEF51C0000-0x000007FEF5BAC000-memory.dmp

Filesize
9.9MB

Download
memory/1660-8-0x000007FEF51C0000-0x000007FEF5BAC000-memory.dmp

Filesize
9.9MB

Download
memory/1660-7-0x0000000000CF0000-0x0000000001014000-memory.dmp

Filesize
3.1MB

Download
memory/1660-11-0x000007FEF51C0000-0x000007FEF5BAC000-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