Analysis
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max time kernel
93s -
max time network
102s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system -
submitted
02-11-2024 11:39
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20241023-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
96dbf079644fad007ddee4a898bdb096
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SHA1
3eec62ed768ce4a1181f00a0dd6cca3564e1f9f1
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SHA256
3b3900adf2232fb5a995c9f6884feededfbe4a862a076ac3af936e4b5a858887
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SHA512
356a13c7ab5bb02ee79a2ff9525f0f8ca832302fba37cf140af8264d31933a00745b59d7f742a42ef0576964f6e112580430996ac068f63c4112907c69471385
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SSDEEP
49152:KvDI22SsaNYfdPBldt698dBcjHEpSu1J/goGdXTHHB72eh2NT:Kv822SsaNYfdPBldt6+dBcjHEpSJ
Malware Config
Extracted
quasar
1.4.1
Office04
192.168.0.102:4782
a84f48f3-00c9-414a-a093-49d616e432d3
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encryption_key
D440572F816847D4B5AD6EAA65627B5DFFF00151
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install_name
Client.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
Quasar Client Startup
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subdirectory
SubDir
Signatures
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Quasar family
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Quasar payload 2 IoCs
Processes:
resource yara_rule behavioral2/memory/2208-1-0x0000000000810000-0x0000000000B34000-memory.dmp family_quasar behavioral2/files/0x000c000000023b61-6.dat family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid Process 4856 Client.exe -
Modifies data under HKEY_USERS 64 IoCs
Processes:
SearchProtocolHost.exeSearchFilterHost.exeSearchIndexer.exedescription ioc Process Set value (data) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Shell Extensions\Cached\{5383EF74-273B-4278-AB0C-CDAA9FD5369E} {886D8EEB-8CF2-4446-8D02-CDBA1DBDCF99} 0xFFFF = 010000000000000039bcf31d1c2ddb01 SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Program Files\Microsoft Office\Root\VFS\ProgramFilesCommonX86\Microsoft Shared\Office16\oregres.dll,-123 = "Microsoft Word Document" SearchProtocolHost.exe Key created \REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\MPEG2Demultiplexer SearchFilterHost.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.aifc\OpenWithList SearchProtocolHost.exe Key created \REGISTRY\USER\.DEFAULT\Software SearchProtocolHost.exe Set value (data) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Shell Extensions\Cached\{C120DE80-FDE4-49F5-A713-E902EF062B8A} {886D8EEB-8CF2-4446-8D02-CDBA1DBDCF99} 0xFFFF = 01000000000000001364be1e1c2ddb01 SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\C:\Windows\system32,@elscore.dll,-10 = "Microsoft Hangul Decomposition Transliteration" SearchIndexer.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\C:\Windows\system32,@elscore.dll,-7 = "Microsoft Devanagari to Latin Transliteration" SearchIndexer.exe Set value (data) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Shell Extensions\Cached\{01BE4CFB-129A-452B-A209-F9D40B3B84A5} {886D8EEB-8CF2-4446-8D02-CDBA1DBDCF99} 0xFFFF = 01000000000000008645fd1d1c2ddb01 SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Program Files\Microsoft Office\Root\VFS\ProgramFilesCommonX86\Microsoft Shared\Office16\oregres.dll,-184 = "Microsoft PowerPoint Macro-Enabled Design Template" SearchProtocolHost.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Shell Extensions\Cached SearchFilterHost.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Program Files\Microsoft Office\Root\VFS\ProgramFilesCommonX86\Microsoft Shared\Office16\oregres.dll,-116 = "Microsoft Excel Template" SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@windows.storage.dll,-34583 = "Saved Pictures" SearchProtocolHost.exe Set value (data) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Shell Extensions\Cached\{F81B1B56-7613-4EE4-BC05-1FAB5DE5C07E} {886D8EEB-8CF2-4446-8D02-CDBA1DBDCF99} 0xFFFF = 0100000000000000699fb91e1c2ddb01 SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Program Files\Microsoft Office\Root\VFS\ProgramFilesCommonX86\Microsoft Shared\Office16\oregres.dll,-174 = "Microsoft PowerPoint Presentation" SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\C:\Windows\system32,@elscore.dll,-9 = "Microsoft Bengali to Latin Transliteration" SearchIndexer.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Windows\System32\searchfolder.dll,-9023 = "Saved Search" SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Program Files\Microsoft Office\Root\VFS\ProgramFilesCommonX86\Microsoft Shared\Office16\oregres.dll,-114 = "OpenDocument Spreadsheet" SearchProtocolHost.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.aifc SearchProtocolHost.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer SearchProtocolHost.exe Set value (data) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Shell Extensions\Cached\{33154C99-BF49-443D-A73C-303A23ABBE97} {886D8EEB-8CF2-4446-8D02-CDBA1DBDCF99} 0xFFFF = 01000000000000000ce3fa1d1c2ddb01 SearchProtocolHost.exe Set value (data) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Shell Extensions\Cached\{3DBEE9A1-C471-4B95-BBCA-F39310064458} {886D8EEB-8CF2-4446-8D02-CDBA1DBDCF99} 0xFFFF = 0100000000000000a421b81d1c2ddb01 SearchProtocolHost.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.mht\OpenWithList SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Program Files\Microsoft Office\Root\VFS\ProgramFilesCommonX86\Microsoft Shared\Office16\oregres.dll,-176 = "Microsoft PowerPoint Macro-Enabled Presentation" SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Program Files\Microsoft Office\Root\VFS\ProgramFilesCommonX86\Microsoft Shared\Office16\oregres.dll,-103 = "Microsoft Excel Macro-Enabled Worksheet" SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\C:\Windows\system32,@elscore.dll,-1 = "Microsoft Language Detection" SearchIndexer.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.aiff SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Windows\System32\ieframe.dll,-10046 = "Internet Shortcut" SearchProtocolHost.exe Set value (data) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Shell Extensions\Cached\{97E467B4-98C6-4F19-9588-161B7773D6F6} {886D8EEB-8CF2-4446-8D02-CDBA1DBDCF99} 0xFFFF = 0100000000000000201ff61d1c2ddb01 SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Program Files\Microsoft Office\Root\VFS\ProgramFilesCommonX86\Microsoft Shared\Office16\oregres.dll,-111 = "Microsoft Excel Macro-Enabled Template" SearchProtocolHost.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\MPEG2Demultiplexer SearchFilterHost.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.pdf\OpenWithList SearchProtocolHost.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.svg SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Windows\system32\unregmp2.exe,-9936 = "QuickTime Movie" SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\C:\Windows\system32,@elscore.dll,-4 = "Microsoft Simplified Chinese to Traditional Chinese Transliteration" SearchIndexer.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\C:\Windows\system32,@elscore.dll,-8 = "Microsoft Malayalam to Latin Transliteration" SearchIndexer.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Windows\System32\Windows.UI.Immersive.dll,-38304 = "Public Account Pictures" SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Program Files\Microsoft Office\Root\VFS\ProgramFilesCommonX86\Microsoft Shared\Office16\oregres.dll,-101 = "Microsoft Excel Worksheet" SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Windows\System32\ieframe.dll,-12385 = "Favorites Bar" SearchProtocolHost.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.DVR-MS\OpenWithList SearchProtocolHost.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.aiff\OpenWithList SearchProtocolHost.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\ActiveMovie\devenum 64-bit\{E0F158E1-CB04-11D0-BD4E-00A0C911CE86}\Default DirectSound Device SearchFilterHost.exe Key created \REGISTRY\USER\.DEFAULT\Software SearchFilterHost.exe Set value (data) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Shell Extensions\Cached\{5985FC23-2588-4D9A-B38B-7E7AFFAB3155} {886D8EEB-8CF2-4446-8D02-CDBA1DBDCF99} 0xFFFF = 01000000000000004231281e1c2ddb01 SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Windows\system32\unregmp2.exe,-9905 = "Video Clip" SearchProtocolHost.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates SearchFilterHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Program Files\Microsoft Office\Root\VFS\ProgramFilesCommonX86\Microsoft Shared\Office16\oregres.dll,-175 = "Microsoft PowerPoint Slide Show" SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Program Files\Microsoft Office\Root\VFS\ProgramFilesCommonX86\Microsoft Shared\Office16\oregres.dll,-127 = "OpenDocument Text" SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Program Files\Microsoft Office\Root\VFS\ProgramFilesCommonX86\Microsoft Shared\Office16\oregres.dll,-140 = "Microsoft OneNote Section" SearchProtocolHost.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion SearchFilterHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Windows\System32\ieframe.dll,-913 = "MHTML Document" SearchProtocolHost.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft SearchFilterHost.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.htm\OpenWithList SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Windows\system32\unregmp2.exe,-9907 = "MIDI Sequence" SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Windows\System32\ieframe.dll,-912 = "HTML Document" SearchProtocolHost.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\ActiveMovie SearchFilterHost.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows SearchFilterHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@C:\Windows\system32\notepad.exe,-469 = "Text Document" SearchProtocolHost.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.mhtml SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@windows.storage.dll,-21825 = "3D Objects" SearchProtocolHost.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Shell Extensions\Cached SearchProtocolHost.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\C:\Windows\system32,@elscore.dll,-6 = "Microsoft Cyrillic to Latin Transliteration" SearchIndexer.exe Set value (data) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Shell Extensions\Cached\{1E589E9D-8A8D-46D9-A2F9-E6D4F8161EE9} {886D8EEB-8CF2-4446-8D02-CDBA1DBDCF99} 0xFFFF = 0100000000000000d9cb441e1c2ddb01 SearchProtocolHost.exe -
Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
Processes:
schtasks.exeschtasks.exepid Process 1440 schtasks.exe 1868 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 28 IoCs
Processes:
Client-built.exeClient.exeSearchIndexer.exedescription pid Process Token: SeDebugPrivilege 2208 Client-built.exe Token: SeDebugPrivilege 4856 Client.exe Token: 33 4788 SearchIndexer.exe Token: SeIncBasePriorityPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe Token: SeTakeOwnershipPrivilege 4788 SearchIndexer.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid Process 4856 Client.exe -
Suspicious use of WriteProcessMemory 10 IoCs
Processes:
Client-built.exeClient.exeSearchIndexer.exedescription pid Process procid_target PID 2208 wrote to memory of 1868 2208 Client-built.exe 86 PID 2208 wrote to memory of 1868 2208 Client-built.exe 86 PID 2208 wrote to memory of 4856 2208 Client-built.exe 88 PID 2208 wrote to memory of 4856 2208 Client-built.exe 88 PID 4856 wrote to memory of 1440 4856 Client.exe 89 PID 4856 wrote to memory of 1440 4856 Client.exe 89 PID 4788 wrote to memory of 2376 4788 SearchIndexer.exe 108 PID 4788 wrote to memory of 2376 4788 SearchIndexer.exe 108 PID 4788 wrote to memory of 4568 4788 SearchIndexer.exe 109 PID 4788 wrote to memory of 4568 4788 SearchIndexer.exe 109 -
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.
Processes
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C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2208 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
PID:1868
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4856 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
PID:1440
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C:\Windows\System32\rundll32.exeC:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding1⤵PID:2108
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C:\Windows\system32\SearchIndexer.exeC:\Windows\system32\SearchIndexer.exe /Embedding1⤵
- Modifies data under HKEY_USERS
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4788 -
C:\Windows\system32\SearchProtocolHost.exe"C:\Windows\system32\SearchProtocolHost.exe" Global\UsGthrFltPipeMssGthrPipe1_ Global\UsGthrCtrlFltPipeMssGthrPipe1 1 -2147483646 "Software\Microsoft\Windows Search" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT; MS Search 4.0 Robot)" "C:\ProgramData\Microsoft\Search\Data\Temp\usgthrsvc" "DownLevelDaemon"2⤵
- Modifies data under HKEY_USERS
PID:2376
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C:\Windows\system32\SearchFilterHost.exe"C:\Windows\system32\SearchFilterHost.exe" 0 800 804 812 8192 808 7842⤵
- Modifies data under HKEY_USERS
PID:4568
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD596dbf079644fad007ddee4a898bdb096
SHA13eec62ed768ce4a1181f00a0dd6cca3564e1f9f1
SHA2563b3900adf2232fb5a995c9f6884feededfbe4a862a076ac3af936e4b5a858887
SHA512356a13c7ab5bb02ee79a2ff9525f0f8ca832302fba37cf140af8264d31933a00745b59d7f742a42ef0576964f6e112580430996ac068f63c4112907c69471385