quasar | aeefbc3356c7f36db8a4d7f12ef63c8d6ff4c8bed178ec31cf6cab49f8b03d50

General

Target

BloxScripts.exe
Size

12.8MB
MD5

1705aca93e5b467a60a3558345306428
SHA1

7f6e72e63a22edd278c81e7a6b760856636259b7
SHA256

aeefbc3356c7f36db8a4d7f12ef63c8d6ff4c8bed178ec31cf6cab49f8b03d50
SHA512

11f1718d570aba665b8bba37a0133c3916d0a55213e70f3729bf2c51f84b70a73fa7ea77d659de546dd60995509ba35d9671099e7b30397c1f232c36ff91da97
SSDEEP

393216:vfChwrd42aSS4PDzy1Nt/3ANKBu0MCfD14o:3Iwx4KDDz0a3dCf2o

Score

10^/10

quasar office04 discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.191:4782

Mutex

ce9247ec-b417-4093-b0d1-2caaee0d1141

Attributes

encryption_key
C2C5B6669CD8FD67ABE180D329CF60300D8F95A2
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 family
quasar

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/files/0x0007000000023e2d-19.dat	family_quasar
behavioral2/memory/224-28-0x0000000000560000-0x0000000000884000-memory.dmp	family_quasar

Downloads MZ/PE file 1 IoCs

flow	pid	Process
40	1544	Process not Found

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-189444705-1272902858-1305688695-1000\Control Panel\International\Geo\Nation	BloxScripts.exe

Executes dropped EXE 2 IoCs

pid	Process
224	Client-built.exe
4004	Client.exe

Drops desktop.ini file(s) 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Local\Temp\RarSFX0\BloxScript\desktop.ini	BloxScripts.exe
File opened for modification	C:\Users\Admin\AppData\Local\Temp\RarSFX0\BloxScript\desktop.ini	BloxScripts.exe

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

System Information Discovery
T1082

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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MicrosoftEdgeUpdate.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
988	MicrosoftEdgeUpdate.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-189444705-1272902858-1305688695-1000_Classes\Local Settings	BloxScripts.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

pid	Process
4056	schtasks.exe
4120	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	224	Client-built.exe
Token: SeDebugPrivilege	4004	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4004	Client.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 3624 wrote to memory of 224	3624	BloxScripts.exe	88
PID 3624 wrote to memory of 224	3624	BloxScripts.exe	88
PID 224 wrote to memory of 4056	224	Client-built.exe	92
PID 224 wrote to memory of 4056	224	Client-built.exe	92
PID 224 wrote to memory of 4004	224	Client-built.exe	94
PID 224 wrote to memory of 4004	224	Client-built.exe	94
PID 4004 wrote to memory of 4120	4004	Client.exe	95
PID 4004 wrote to memory of 4120	4004	Client.exe	95

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\BloxScripts.exe
"C:\Users\Admin\AppData\Local\Temp\BloxScripts.exe"
1⤵
- Checks computer location settings
- Drops desktop.ini file(s)
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3624
- C:\Users\Admin\AppData\Local\Temp\RarSFX0\Client-built.exe
  "C:\Users\Admin\AppData\Local\Temp\RarSFX0\Client-built.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:224
- - 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:4056
- - 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 SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4004
  - - 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:4120

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:244

C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
"C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSI0IiBpbnN0YWxsZGF0ZXRpbWU9IjE3Mzg5NDU5MjEiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4MzQxODE5ODA3NzAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI1MzA3NTY2NDkxIi8-PC9hcHA-PC9yZXF1ZXN0Pg
1⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
PID:988

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

2

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\RarSFX0\Client-built.exe

Filesize
3.1MB

MD5
fef0c33b8e549660a9ff078bf6aee075

SHA1
b90c4a79806ce43e06c84e3fc5373e0b7b7707e4

SHA256
396ca8c9f6e88d59b1e85e528e4e7b7febe602b043398f3128bcdab58a21f315

SHA512
9b8660c9d292e7db2b1611070c4a57457939b3e6de637add86a4e326013b125e3e6adb66d8d671275994d6e67f88220b8ede0a3f4f58716d2ba5bc2d857fb934

Download Submit
memory/224-27-0x00007FF9407D3000-0x00007FF9407D5000-memory.dmp

Filesize
8KB

Download
memory/224-28-0x0000000000560000-0x0000000000884000-memory.dmp

Filesize
3.1MB

Download
memory/224-29-0x00007FF9407D0000-0x00007FF941291000-memory.dmp

Filesize
10.8MB

Download
memory/224-36-0x00007FF9407D0000-0x00007FF941291000-memory.dmp

Filesize
10.8MB

Download
memory/4004-37-0x000000001B4E0000-0x000000001B530000-memory.dmp

Filesize
320KB

Download
memory/4004-38-0x000000001BD00000-0x000000001BDB2000-memory.dmp

Filesize
712KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads