quasar | 5cc8c3c4d011cdbe7306dfb8ba52b14909ed06db2c1a465c31cc59e6f532cb22

Analysis

max time kernel
143s
max time network
146s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
21/11/2024, 07:40

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General

Target
Psloramyra.ps1
Size 2.1MB
Sample241121-jh2tyavjam
SHA256 5cc8c3c4d011cdbe7306dfb8ba52b14909ed06db2c1a465c31cc59e6f532cb22
MD5 032ea6f45fdd2fa1bd9b6cb5f425dc54
SHA1 aaac83baf4a939a4c3b9ff5a16dbcb472cab9592
SHA512 222ca7941b7df2d2e4d7310a557cc6cdb43c33368d9632610b428b1a117a5c272504dae677216b678e4c65887f779f60078dd6096a1280aa834b1a3fcb97c379
SSDEEP 6144:ccVzJb1d4aU/hQVBJ2A7Is2Csr1l5mH9OdHUb3ngo1:v
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 discovery execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.3.0.0

Botnet

Office04

ronymahmoud.casacam.net:4782
seznam.hopto.org:4782

Mutex

QSR_MUTEX_mn85pQSh0eqrA3kPek

Attributes

encryption_key
EjggXOgdqRrj8wGQ7mTy
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 1 IoCs

resource	yara_rule
behavioral2/memory/3592-35-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar

Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
4724	powershell.exe
2928	powershell.exe

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-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	WScript.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
41	ip-api.com

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2928 set thread context of 3592	2928	powershell.exe	106

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	RegSvcs.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4724	powershell.exe
4724	powershell.exe
2928	powershell.exe
2928	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4724	powershell.exe
Token: SeDebugPrivilege	2928	powershell.exe
Token: SeDebugPrivilege	3592	RegSvcs.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 3544 wrote to memory of 68	3544	WScript.exe	103
PID 3544 wrote to memory of 68	3544	WScript.exe	103
PID 68 wrote to memory of 2928	68	cmd.exe	105
PID 68 wrote to memory of 2928	68	cmd.exe	105
PID 2928 wrote to memory of 3592	2928	powershell.exe	106
PID 2928 wrote to memory of 3592	2928	powershell.exe	106
PID 2928 wrote to memory of 3592	2928	powershell.exe	106
PID 2928 wrote to memory of 3592	2928	powershell.exe	106
PID 2928 wrote to memory of 3592	2928	powershell.exe	106
PID 2928 wrote to memory of 3592	2928	powershell.exe	106
PID 2928 wrote to memory of 3592	2928	powershell.exe	106
PID 2928 wrote to memory of 3592	2928	powershell.exe	106

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:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\Psloramyra.ps1
1⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4724

C:\Windows\System32\WScript.exe
C:\Windows\System32\WScript.exe "C:\Users\Public\roox.vbs"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3544
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Public\roox.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:68
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -NoProfile -WindowStyle Hidden -ExecutionPolicy Bypass -Command "& 'C:\Users\Public\roox.ps1'"
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2928
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe"
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      PID:3592

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

powershell.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
Size 2KB
SHA256 3b0068d29ae4b20c447227fbf410aa2deedfef6220ccc3f698f3c7707c032c55
MD5 2f57fde6b33e89a63cf0dfdd6e60a351
SHA1 445bf1b07223a04f8a159581a3d37d630273010f
SHA512 42857c5f111bfa163e9f4ea6b81a42233d0bbb0836ecc703ce7e8011b6f8a8eca761f39adc3ed026c9a2f99206d88bab9bddb42da9113e478a31a6382af5c220
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 1KB
SHA256 7854010dfa1f008ac8f26493dfbbc378bafb67e4e3dc9d1a13ce408668f2fac4
MD5 11a4be5f9e5fdf4a714849b63ea2f086
SHA1 97ec6e61a365b04d572e100699c37ebbbda9c5d2
SHA512 807ea1222e227985901057c3337d80b587174b3e8b9e50d4d8b4bd67ce500e3e891057f318b74c401196612dcb969862bb6edda2f938f573a54ac53ff88efea8
MD5 SHA1 SHA512

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__PSScriptPolicyTest_ygadk13l.mb2.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ygadk13l.mb2.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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roox.bat

Path C:\Users\Public\roox.bat
Size 195B
SHA256 a3a38fb5090f5b9c951160d60d2fcd0e4488b3e72b1823fc17ef34a15fe9dab7
MD5 0344d401c7266a2bc6d19f5a2bc90040
SHA1 d3bf5a4b55b523429f3c7cb58ffa19504bececfc
SHA512 59b448d02dadd2934abf88c40e25fec741724112e1320770b06df9b862643f2eba9cedee9d58244145fbece6d0d366380d6d2d6b56082a97649683ca10f9bc07
MD5 SHA1 SHA512

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roox.ps1

Path C:\Users\Public\roox.ps1
Size 2.1MB
SHA256 a2fde94bdfe9e8d15478484c3de0314a73618f41591cbffca473708c66899e39
MD5 9ba3e0c0ba321f160209023c4fdcc3d4
SHA1 55f876754d36ab08a3e8f0a47d39c48b8a84fb61
SHA512 cd551a87d48421748a9e8c90eeecbd48a185be5b7439e2d35ac994da07bc94ee77f48678b7f617423bb9356dabc20f62ec77be24ddbd60e34d0927fde350e650
SSDEEP 6144:ecVzJb1d4aU/hQVBJ2A7Is2Csr1l5mH9OdHUb3ngoW:i
MD5 SHA1 SHA512 SSDEEP

Submit Download

roox.vbs

Path C:\Users\Public\roox.vbs
Size 686B
SHA256 22889b8d447ea679e8b2fb27eca95d0f04056203c9214818758b0a21379ea323
MD5 a0a3c05080df4421295e559291304405
SHA1 286e02a003b7e26a381e41d2127ffb0ed371f5b4
SHA512 ee9971cda442f9dd305e0810babd0a5f94589a966b2a4f10421b341d6e7914fed3f2a12821dc56d338f7ec5ba9a38830727d0e17fd18257e45ebabd7612e99b4
MD5 SHA1 SHA512

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memory/2928-34-0x000002CD585C0000-0x000002CD585DA000-memory.dmp

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memory/3592-38-0x00000000055B0000-0x0000000005642000-memory.dmp

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memory/3592-35-0x0000000000400000-0x000000000045E000-memory.dmp

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memory/3592-37-0x0000000005A80000-0x0000000006024000-memory.dmp

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memory/3592-39-0x0000000005680000-0x00000000056E6000-memory.dmp

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memory/3592-40-0x00000000063D0000-0x00000000063E2000-memory.dmp

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memory/3592-41-0x0000000006810000-0x000000000684C000-memory.dmp

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memory/3592-42-0x0000000006F30000-0x0000000006F3A000-memory.dmp

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memory/4724-19-0x00007FFF45D90000-0x00007FFF46851000-memory.dmp

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memory/4724-16-0x00007FFF45D90000-0x00007FFF46851000-memory.dmp

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memory/4724-12-0x00007FFF45D90000-0x00007FFF46851000-memory.dmp

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memory/4724-11-0x00007FFF45D90000-0x00007FFF46851000-memory.dmp

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memory/4724-6-0x00000234AA790000-0x00000234AA7B2000-memory.dmp

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memory/4724-0-0x00007FFF45D93000-0x00007FFF45D95000-memory.dmp

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