quasar | 40bc721618bfa9595331b7b7bb3a5955be4d3c7e9ca58a063769e16c5b2e605a

General

Target

40bc721618bfa9595331b7b7bb3a5955be4d3c7e9ca58a063769e16c5b2e605a.exe
Size

4.7MB
MD5

280ad7fce13d25ab4190070bbae22e12
SHA1

474920d6b01a092845815aec815519e7792444ce
SHA256

40bc721618bfa9595331b7b7bb3a5955be4d3c7e9ca58a063769e16c5b2e605a
SHA512

53d58a7814ccad7a23cb466e56ff2e1f016089fdc5c2bb54d3ccb61ba77475538388a5236b24db07f2ceaca6c39eb3911e7915d13be15f633388cf1bb7b77d5a
SSDEEP

98304:yZoSzXIZ7Svr22SsaNYfdPBldt6+dBcjHtKRJ6BLIbzZhIbzZY:Gw7UM7jGIUAK

Score

10^/10

quasar office04 discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

mx5.deitie.asia:4495

Mutex

ebbf737a-dddd-43dd-9b0a-74831302455d

Attributes

encryption_key
F8516D89A1DFD78BD8FF575BBC3AE828B47FF0E1
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral1/files/0x000c00000001202c-1.dat	family_quasar
behavioral1/memory/1156-6-0x0000000000010000-0x0000000000334000-memory.dmp	family_quasar
behavioral1/memory/2064-13-0x0000000000EF0000-0x0000000001214000-memory.dmp	family_quasar

Drops startup file 1 IoCs

Processes:

40bc721618bfa9595331b7b7bb3a5955be4d3c7e9ca58a063769e16c5b2e605a.exe

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exe	40bc721618bfa9595331b7b7bb3a5955be4d3c7e9ca58a063769e16c5b2e605a.exe

Executes dropped EXE 2 IoCs

Processes:

sign.exeClient.exe

pid	Process
1156	sign.exe
2064	Client.exe

Loads dropped DLL 1 IoCs

Processes:

40bc721618bfa9595331b7b7bb3a5955be4d3c7e9ca58a063769e16c5b2e605a.exe

pid	Process
2600	40bc721618bfa9595331b7b7bb3a5955be4d3c7e9ca58a063769e16c5b2e605a.exe

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

Processes:

40bc721618bfa9595331b7b7bb3a5955be4d3c7e9ca58a063769e16c5b2e605a.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	40bc721618bfa9595331b7b7bb3a5955be4d3c7e9ca58a063769e16c5b2e605a.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

Processes:

schtasks.exeschtasks.exe

pid	Process
2016	schtasks.exe
2784	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

40bc721618bfa9595331b7b7bb3a5955be4d3c7e9ca58a063769e16c5b2e605a.exe

pid	Process
2600	40bc721618bfa9595331b7b7bb3a5955be4d3c7e9ca58a063769e16c5b2e605a.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

sign.exeClient.exe

description	pid	Process
Token: SeDebugPrivilege	1156	sign.exe
Token: SeDebugPrivilege	2064	Client.exe

Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

40bc721618bfa9595331b7b7bb3a5955be4d3c7e9ca58a063769e16c5b2e605a.exe

pid	Process
2600	40bc721618bfa9595331b7b7bb3a5955be4d3c7e9ca58a063769e16c5b2e605a.exe
2600	40bc721618bfa9595331b7b7bb3a5955be4d3c7e9ca58a063769e16c5b2e605a.exe

Suspicious use of WriteProcessMemory 13 IoCs

Processes:

40bc721618bfa9595331b7b7bb3a5955be4d3c7e9ca58a063769e16c5b2e605a.exesign.exeClient.exe

description	pid	Process	procid_target
PID 2600 wrote to memory of 1156	2600	40bc721618bfa9595331b7b7bb3a5955be4d3c7e9ca58a063769e16c5b2e605a.exe	30
PID 2600 wrote to memory of 1156	2600	40bc721618bfa9595331b7b7bb3a5955be4d3c7e9ca58a063769e16c5b2e605a.exe	30
PID 2600 wrote to memory of 1156	2600	40bc721618bfa9595331b7b7bb3a5955be4d3c7e9ca58a063769e16c5b2e605a.exe	30
PID 2600 wrote to memory of 1156	2600	40bc721618bfa9595331b7b7bb3a5955be4d3c7e9ca58a063769e16c5b2e605a.exe	30
PID 1156 wrote to memory of 2016	1156	sign.exe	31
PID 1156 wrote to memory of 2016	1156	sign.exe	31
PID 1156 wrote to memory of 2016	1156	sign.exe	31
PID 1156 wrote to memory of 2064	1156	sign.exe	33
PID 1156 wrote to memory of 2064	1156	sign.exe	33
PID 1156 wrote to memory of 2064	1156	sign.exe	33
PID 2064 wrote to memory of 2784	2064	Client.exe	34
PID 2064 wrote to memory of 2784	2064	Client.exe	34
PID 2064 wrote to memory of 2784	2064	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\40bc721618bfa9595331b7b7bb3a5955be4d3c7e9ca58a063769e16c5b2e605a.exe
"C:\Users\Admin\AppData\Local\Temp\40bc721618bfa9595331b7b7bb3a5955be4d3c7e9ca58a063769e16c5b2e605a.exe"
1⤵
- Drops startup file
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2600
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\\sign.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1156
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2016
- - C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2064
  - - C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:2784

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 Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exe

Filesize
3.1MB

MD5
7498d554976744dfbd271ba755c6c192

SHA1
ec733d01e776518e387d2f51d1a6559b81f03b1e

SHA256
44089202623b9671051aa5bba5e72f81f68ce818c3054dde57726aaa6dcb9ff7

SHA512
d4e987d0e6235001fac4ae3a634e8fe98c6830e26a6a6876fbc36262842688d3ec301cff75003d2af695cdfd357ac50919946695b7d5d3293ebcba97153e1030

Download Submit
memory/1156-5-0x000007FEF5D93000-0x000007FEF5D94000-memory.dmp

Filesize
4KB

Download
memory/1156-6-0x0000000000010000-0x0000000000334000-memory.dmp

Filesize
3.1MB

Download
memory/1156-7-0x000007FEF5D90000-0x000007FEF677C000-memory.dmp

Filesize
9.9MB

Download
memory/1156-14-0x000007FEF5D90000-0x000007FEF677C000-memory.dmp

Filesize
9.9MB

Download
memory/2064-13-0x0000000000EF0000-0x0000000001214000-memory.dmp

Filesize
3.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads