Analysis
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max time kernel
88s -
max time network
16s -
platform
windows7_x64 -
resource
win7-20240705-en -
resource tags
arch:x64arch:x86image:win7-20240705-enlocale:en-usos:windows7-x64system -
submitted
29-08-2024 10:24
Behavioral task
behavioral1
Sample
WinRAR.exe
Resource
win7-20240705-en
General
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Target
WinRAR.exe
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Size
270KB
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MD5
14ea366be5cb691078be2c302590f435
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SHA1
84e562bb99249a58849f6f82b29a7746dd144900
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SHA256
82e6b71b99a6ec602cfbdc00e0bbaf34c719d7b6879b6e384004886d491ad45a
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SHA512
9be5097295010fa04e04fcae578b19ab43935b09a70d8b31a038fd1ef7ed89dcd9143b82400e8d31913bf32a7a18628557dfaa1f4d37c1e7c8062d7a7368afb9
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SSDEEP
6144:r02q9t3hysg2+00aHYHjdCoD5oa+S/dIm:Aj3hBg/00aHYDd3DCO/dI
Malware Config
Extracted
C:\Users\Admin\AppData\Local\Google\Chrome\User Data\NOTE!.txt
Signatures
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Chaos
Ransomware family first seen in June 2021.
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Chaos Ransomware 3 IoCs
resource yara_rule behavioral1/memory/2036-1-0x0000000001240000-0x0000000001288000-memory.dmp family_chaos behavioral1/files/0x0008000000012119-6.dat family_chaos behavioral1/memory/2316-8-0x0000000000D10000-0x0000000000D58000-memory.dmp family_chaos -
Deletes shadow copies 3 TTPs
Ransomware often targets backup files to inhibit system recovery.
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pid Process 1960 wbadmin.exe -
Disables Task Manager via registry modification
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Drops startup file 2 IoCs
description ioc Process File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini WinRAR.exe File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\NOTE!.txt WinRAR.exe -
Executes dropped EXE 1 IoCs
pid Process 2316 WinRAR.exe -
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3502430532-24693940-2469786940-1000\Software\Microsoft\Windows\CurrentVersion\Run\UpdateTask = "C:\\Users\\Admin\\AppData\\Roaming\\WinRAR.exe" WinRAR.exe -
Drops desktop.ini file(s) 64 IoCs
description ioc Process File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\G2KVEH0D\desktop.ini WinRAR.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\Desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Recorded TV\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Videos\desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Music\Sample Music\desktop.ini WinRAR.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-3502430532-24693940-2469786940-1000\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Desktop\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Documents\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Downloads\desktop.ini WinRAR.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Tablet PC\Desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Favorites\Links\desktop.ini WinRAR.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\Desktop.ini WinRAR.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini WinRAR.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Recorded TV\Sample Media\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\72EHROQQ\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\B6089GTH\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Libraries\desktop.ini WinRAR.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Favorites\Links for United States\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Favorites\desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Videos\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\History\History.IE5\desktop.ini WinRAR.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Ringtones\desktop.ini WinRAR.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Games\Desktop.ini WinRAR.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Desktop\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\Desktop.ini WinRAR.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Pictures\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Links\desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Pictures\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\3WOHY2HJ\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\AWH2H80Y\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\7JXML4U5\desktop.ini WinRAR.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Documents\desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Libraries\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows Mail\Stationery\Desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\SendTo\Desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Music\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Saved Games\desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Pictures\Sample Pictures\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Contacts\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\CNQY6MQU\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\History\desktop.ini WinRAR.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\Desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Downloads\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini WinRAR.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini WinRAR.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\Desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Videos\Sample Videos\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Searches\desktop.ini WinRAR.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\SendTo\Desktop.ini WinRAR.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3502430532-24693940-2469786940-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\t8x5jqn2o.jpg" WinRAR.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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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.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language DllHost.exe -
Interacts with shadow copies 3 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 2740 vssadmin.exe -
Suspicious behavior: AddClipboardFormatListener 2 IoCs
pid Process 2036 WinRAR.exe 2316 WinRAR.exe -
Suspicious behavior: EnumeratesProcesses 6 IoCs
pid Process 2036 WinRAR.exe 2036 WinRAR.exe 2036 WinRAR.exe 2316 WinRAR.exe 2316 WinRAR.exe 2316 WinRAR.exe -
Suspicious use of AdjustPrivilegeToken 52 IoCs
description pid Process Token: SeDebugPrivilege 2036 WinRAR.exe Token: SeDebugPrivilege 2316 WinRAR.exe Token: SeBackupPrivilege 2860 vssvc.exe Token: SeRestorePrivilege 2860 vssvc.exe Token: SeAuditPrivilege 2860 vssvc.exe Token: SeIncreaseQuotaPrivilege 2776 WMIC.exe Token: SeSecurityPrivilege 2776 WMIC.exe Token: SeTakeOwnershipPrivilege 2776 WMIC.exe Token: SeLoadDriverPrivilege 2776 WMIC.exe Token: SeSystemProfilePrivilege 2776 WMIC.exe Token: SeSystemtimePrivilege 2776 WMIC.exe Token: SeProfSingleProcessPrivilege 2776 WMIC.exe Token: SeIncBasePriorityPrivilege 2776 WMIC.exe Token: SeCreatePagefilePrivilege 2776 WMIC.exe Token: SeBackupPrivilege 2776 WMIC.exe Token: SeRestorePrivilege 2776 WMIC.exe Token: SeShutdownPrivilege 2776 WMIC.exe Token: SeDebugPrivilege 2776 WMIC.exe Token: SeSystemEnvironmentPrivilege 2776 WMIC.exe Token: SeRemoteShutdownPrivilege 2776 WMIC.exe Token: SeUndockPrivilege 2776 WMIC.exe Token: SeManageVolumePrivilege 2776 WMIC.exe Token: 33 2776 WMIC.exe Token: 34 2776 WMIC.exe Token: 35 2776 WMIC.exe Token: SeIncreaseQuotaPrivilege 2776 WMIC.exe Token: SeSecurityPrivilege 2776 WMIC.exe Token: SeTakeOwnershipPrivilege 2776 WMIC.exe Token: SeLoadDriverPrivilege 2776 WMIC.exe Token: SeSystemProfilePrivilege 2776 WMIC.exe Token: SeSystemtimePrivilege 2776 WMIC.exe Token: SeProfSingleProcessPrivilege 2776 WMIC.exe Token: SeIncBasePriorityPrivilege 2776 WMIC.exe Token: SeCreatePagefilePrivilege 2776 WMIC.exe Token: SeBackupPrivilege 2776 WMIC.exe Token: SeRestorePrivilege 2776 WMIC.exe Token: SeShutdownPrivilege 2776 WMIC.exe Token: SeDebugPrivilege 2776 WMIC.exe Token: SeSystemEnvironmentPrivilege 2776 WMIC.exe Token: SeRemoteShutdownPrivilege 2776 WMIC.exe Token: SeUndockPrivilege 2776 WMIC.exe Token: SeManageVolumePrivilege 2776 WMIC.exe Token: 33 2776 WMIC.exe Token: 34 2776 WMIC.exe Token: 35 2776 WMIC.exe Token: SeBackupPrivilege 2032 wbengine.exe Token: SeRestorePrivilege 2032 wbengine.exe Token: SeSecurityPrivilege 2032 wbengine.exe Token: 33 1276 AUDIODG.EXE Token: SeIncBasePriorityPrivilege 1276 AUDIODG.EXE Token: 33 1276 AUDIODG.EXE Token: SeIncBasePriorityPrivilege 1276 AUDIODG.EXE -
Suspicious use of WriteProcessMemory 21 IoCs
description pid Process procid_target PID 2036 wrote to memory of 2316 2036 WinRAR.exe 30 PID 2036 wrote to memory of 2316 2036 WinRAR.exe 30 PID 2036 wrote to memory of 2316 2036 WinRAR.exe 30 PID 2316 wrote to memory of 2144 2316 WinRAR.exe 32 PID 2316 wrote to memory of 2144 2316 WinRAR.exe 32 PID 2316 wrote to memory of 2144 2316 WinRAR.exe 32 PID 2144 wrote to memory of 2740 2144 cmd.exe 34 PID 2144 wrote to memory of 2740 2144 cmd.exe 34 PID 2144 wrote to memory of 2740 2144 cmd.exe 34 PID 2144 wrote to memory of 2776 2144 cmd.exe 37 PID 2144 wrote to memory of 2776 2144 cmd.exe 37 PID 2144 wrote to memory of 2776 2144 cmd.exe 37 PID 2316 wrote to memory of 2732 2316 WinRAR.exe 39 PID 2316 wrote to memory of 2732 2316 WinRAR.exe 39 PID 2316 wrote to memory of 2732 2316 WinRAR.exe 39 PID 2732 wrote to memory of 1960 2732 cmd.exe 41 PID 2732 wrote to memory of 1960 2732 cmd.exe 41 PID 2732 wrote to memory of 1960 2732 cmd.exe 41 PID 2316 wrote to memory of 2804 2316 WinRAR.exe 47 PID 2316 wrote to memory of 2804 2316 WinRAR.exe 47 PID 2316 wrote to memory of 2804 2316 WinRAR.exe 47 -
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.
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Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
Processes
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C:\Users\Admin\AppData\Local\Temp\WinRAR.exe"C:\Users\Admin\AppData\Local\Temp\WinRAR.exe"1⤵
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2036 -
C:\Users\Admin\AppData\Roaming\WinRAR.exe"C:\Users\Admin\AppData\Roaming\WinRAR.exe"2⤵
- Drops startup file
- Executes dropped EXE
- Adds Run key to start application
- Drops desktop.ini file(s)
- Sets desktop wallpaper using registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2316 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:2144 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:2740
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:2776
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:2732 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:1960
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\NOTE!.txt3⤵PID:2804
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2860
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2032
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:2680
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵PID:1748
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C:\Windows\system32\taskmgr.exe"C:\Windows\system32\taskmgr.exe" /41⤵PID:1212
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C:\Windows\system32\taskmgr.exe"C:\Windows\system32\taskmgr.exe" /41⤵PID:1788
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C:\Windows\SysWOW64\DllHost.exeC:\Windows\SysWOW64\DllHost.exe /Processid:{06622D85-6856-4460-8DE1-A81921B41C4B}1⤵
- System Location Discovery: System Language Discovery
PID:2860
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C:\Windows\system32\AUDIODG.EXEC:\Windows\system32\AUDIODG.EXE 0x5001⤵
- Suspicious use of AdjustPrivilegeToken
PID:1276
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C:\Windows\system32\OptionalFeatures.exe"C:\Windows\system32\OptionalFeatures.exe"1⤵PID:3016
Network
MITRE ATT&CK Enterprise v15
Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Defense Evasion
Direct Volume Access
1Indicator Removal
3File Deletion
3Modify Registry
2Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
595B
MD57cff3b94ef1413349cdf9d4742f9cd77
SHA10569d834acc4a41e0b47bc1d03dcf27430106096
SHA256bb6cdcdbb8d8b17243cce8bc7c9d7eee1872b63313640e5d63c63619712ddd8d
SHA5121425864a3944742df1f4f849455c3224e2ee281b4c19dbc46af180efaaa1fb35dc14ef047faa02ba92e3d8b5a33ad60cc65c7b4ea9e1182a5b91d01e9edd2873
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Filesize
270KB
MD514ea366be5cb691078be2c302590f435
SHA184e562bb99249a58849f6f82b29a7746dd144900
SHA25682e6b71b99a6ec602cfbdc00e0bbaf34c719d7b6879b6e384004886d491ad45a
SHA5129be5097295010fa04e04fcae578b19ab43935b09a70d8b31a038fd1ef7ed89dcd9143b82400e8d31913bf32a7a18628557dfaa1f4d37c1e7c8062d7a7368afb9
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Filesize
1.3MB
MD5e23be7906863b50f424e0f38577fda17
SHA10a5e39433be3c2fc1da939cd2537209f181d31cf
SHA2565acb728ee3b8e24595c14c01b73b50f7b541da03003fc17e2305d6c74dadf490
SHA5128cbbf0d2120d4262c91b576398e500fa9db8ea654c4cd6c07ed92b91072033cde7fe2e392a1ae9f758a9713650be0cd9570c89f770410b0a395e4a0ea205cd98
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Filesize
1B
MD5d1457b72c3fb323a2671125aef3eab5d
SHA15bab61eb53176449e25c2c82f172b82cb13ffb9d
SHA2568a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1
SHA512ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0
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Filesize
924KB
MD52744ef46e99ba36796ca60bbbe078c1e
SHA1a6ba0d9bbf4c677fe104da12c21ab7ffbf7a1b29
SHA2568e1fb12a10c3ba443e04d8689c2b53541ae55c2d9cbfcd02baeb356e275fc17d
SHA5124b60640b1c7c4054ff6eb8e7ae1cab7bda06c3a695266c14e3bca12696b61de3766e583ffb898b39e2da6fe8466e1a6d6ae47f421b9ca833205d1bf6b97cc5c9
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Filesize
1.3MB
MD5ec2303274c779a17a381d607429b36f2
SHA1635468c031d21bc0262c0bfb1f18373392914b6a
SHA256827d39ec76441790ff3789defa536d4b83741201053146f206a34d4d6a123e11
SHA512ee90584a34b5ef48589bbcd44c7e4dd33eadb338f1835f703d870ba34031b69ba97827dab7bbf6454ead5398aa854a451b0db5cfb28af33ff10da0da5c9e4875
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Filesize
681KB
MD5ea91e2330ded94178fcd90a539ee1361
SHA1c59d359103cab54db666665295f5958c9a45a27a
SHA25668f31361e798b12121d4222597eca47cfc2bb1da0f5d685a9922e3400f37d717
SHA512e2dc7279f89ce124dfccc51650f66c8d29923c324ec94d086b5aaaf2f58f23f8550c638257f1a6561fd3c4982ac7c1ce47511290e7d4cbb5121d64db82dbc685