quasar | e46ddb2b2b2cc74e8306adc682228969d35e2943a917e321bd5db72e744d2d05

Analysis

max time kernel
593s
max time network
599s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
10/05/2024, 13:03

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General

Target
Bloxstrap-v2.5.1-main/BloxStrap v2.5.4.1.exe
Size 3.1MB
Sample240510-qata6abc72
SHA256 52f9d1a2c3d4518da21b3426a0ccefb04e07316755f97de9eaaecc1e09c4b5c7
MD5 4fe3f16488126ea4b072fc6fcfc910b0
SHA1 ba0b203f96f771e61d952ab925b773ac475a141b
SHA512 782a429364de283c8bda39c6f0ffc07847fe3d580a4f0280a9ccd75aeb6420280fe1d0b1a6e61cbd176d8f6fd331b50780c7f8239bff81b6eaf55ae647477697
SSDEEP 49152:uvEt62XlaSFNWPjljiFa2RoUYIjyDHTmzopoGdSweTHHB72eh2NT:uvY62XlaSFNWPjljiFXRoUYIjyDHh
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.114:4782

Mutex

10d94abb-0198-407e-aa98-bb80c5b37835

Attributes

encryption_key
45C885494447187E9FBAD6C4E1ACD4A1590FC706
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Runtime
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral4/memory/4736-1-0x0000000000970000-0x0000000000C94000-memory.dmp	family_quasar
behavioral4/files/0x000800000002346b-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1416	Client.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\SubDir\Client.exe	BloxStrap v2.5.4.1.exe
File opened for modification	C:\Windows\system32\SubDir	BloxStrap v2.5.4.1.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client.exe
File opened for modification	C:\Windows\system32\SubDir	Client.exe
File created	C:\Windows\system32\SubDir\Client.exe	BloxStrap v2.5.4.1.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/Job

T1053

pid	Process
4716	schtasks.exe
2408	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4736	BloxStrap v2.5.4.1.exe
Token: SeDebugPrivilege	1416	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1416	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
1416	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1416	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4736 wrote to memory of 4716	4736	BloxStrap v2.5.4.1.exe	86
PID 4736 wrote to memory of 4716	4736	BloxStrap v2.5.4.1.exe	86
PID 4736 wrote to memory of 1416	4736	BloxStrap v2.5.4.1.exe	88
PID 4736 wrote to memory of 1416	4736	BloxStrap v2.5.4.1.exe	88
PID 1416 wrote to memory of 2408	1416	Client.exe	89
PID 1416 wrote to memory of 2408	1416	Client.exe	89

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\Bloxstrap-v2.5.1-main\BloxStrap v2.5.4.1.exe
"C:\Users\Admin\AppData\Local\Temp\Bloxstrap-v2.5.1-main\BloxStrap v2.5.4.1.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4736
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Runtime" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:4716
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1416
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Runtime" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2408

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

Client.exe

Path C:\Windows\System32\SubDir\Client.exe
Size 3.1MB
SHA256 52f9d1a2c3d4518da21b3426a0ccefb04e07316755f97de9eaaecc1e09c4b5c7
MD5 4fe3f16488126ea4b072fc6fcfc910b0
SHA1 ba0b203f96f771e61d952ab925b773ac475a141b
SHA512 782a429364de283c8bda39c6f0ffc07847fe3d580a4f0280a9ccd75aeb6420280fe1d0b1a6e61cbd176d8f6fd331b50780c7f8239bff81b6eaf55ae647477697
SSDEEP 49152:uvEt62XlaSFNWPjljiFa2RoUYIjyDHTmzopoGdSweTHHB72eh2NT:uvY62XlaSFNWPjljiFXRoUYIjyDHh
MD5 SHA1 SHA512 SSDEEP

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memory/1416-9-0x00007FFD900B0000-0x00007FFD90B71000-memory.dmp

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memory/1416-11-0x00007FFD900B0000-0x00007FFD90B71000-memory.dmp

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memory/1416-12-0x000000001C270000-0x000000001C2C0000-memory.dmp

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memory/1416-13-0x000000001C380000-0x000000001C432000-memory.dmp

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memory/1416-14-0x00007FFD900B0000-0x00007FFD90B71000-memory.dmp

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memory/4736-0-0x00007FFD900B3000-0x00007FFD900B5000-memory.dmp

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memory/4736-1-0x0000000000970000-0x0000000000C94000-memory.dmp

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memory/4736-2-0x00007FFD900B0000-0x00007FFD90B71000-memory.dmp

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memory/4736-10-0x00007FFD900B0000-0x00007FFD90B71000-memory.dmp

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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