Analysis
- max time kernel
147s - max time network
138s - platform
windows10-2004_x64 - resource
win10v2004-20240802-en - resource tags
arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system - submitted
02/09/2024, 12:26
Behavioral task
behavioral1
Sample
lk.exe
Resource
win7-20240729-en
windows7-x64
17 signatures
150 seconds
Behavioral task
behavioral2
Sample
lk.exe
Resource
win10v2004-20240802-en
windows10-2004-x64
21 signatures
150 seconds
General
- Target lk.exe
- Size 146KB
- Sample240902-pl9xls1cnb
- SHA256 e097f98ea3416330ed2fd7856743d68a7ca880c6d57e8c264a384a112ac5a390
- MD5 7f6830b77ad13b244bc5d702d67137bf
- SHA1 1fbd763388a3e9679ac66b35da8a78e041611fe4
- SHA512 488cb83c7267cfc70989e09489373f4372325531f7c02b1711fbdf6dfeaa377c39b84d5e971136e0e41d0a6dcde52ec4d21a749169eedb9e9ba43eb9caf077de
- SSDEEP 3072:c6glyuxE4GsUPnliByocWep0XL63DjDeprS:c6gDBGpvEByocWeOmuNS
- MD5 SHA1 SHA512 SSDEEP
Malware Config
Signatures
- Renames multiple (668) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-355097885-2402257403-2971294179-1000\Control Panel\International\Geo\Nation F454.tmp - Deletes itself 1 IoCs
pid Process 2576 F454.tmp - Executes dropped EXE 1 IoCs
pid Process 2576 F454.tmp - Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Drops desktop.ini file(s) 2 IoCs
description ioc Process File opened for modification C:\$Recycle.Bin\S-1-5-21-355097885-2402257403-2971294179-1000\desktop.ini lk.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-355097885-2402257403-2971294179-1000\desktop.ini lk.exe - Indicator Removal: File Deletion 1 TTPs
Adversaries may delete files left behind by the actions of their intrusion activity.
- Drops file in System32 directory 4 IoCs
description ioc Process File created C:\Windows\system32\spool\PRINTERS\00002.SPL splwow64.exe File created C:\Windows\system32\spool\PRINTERS\PP25o6yerdn57hyodxzuup1ui3c.TMP printfilterpipelinesvc.exe File created C:\Windows\system32\spool\PRINTERS\PP0v2o8cf8qol04uk2nqk1mr00.TMP printfilterpipelinesvc.exe File created C:\Windows\system32\spool\PRINTERS\PPa337ahnub7pxdkhs70w63cffb.TMP printfilterpipelinesvc.exe - Sets desktop wallpaper using registry 2 TTPs 2 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-355097885-2402257403-2971294179-1000\Control Panel\Desktop\WallPaper = "C:\\ProgramData\\XQk8iLzOQ.bmp" lk.exe Set value (str) \REGISTRY\USER\S-1-5-21-355097885-2402257403-2971294179-1000\Control Panel\Desktop\Wallpaper = "C:\\ProgramData\\XQk8iLzOQ.bmp" lk.exe - Suspicious use of NtSetInformationThreadHideFromDebugger 5 IoCs
pid Process 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 2576 F454.tmp - Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- System Location Discovery: System Language Discovery 1 TTPs 3 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 lk.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language F454.tmp Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language cmd.exe - Checks processor information in registry 2 TTPs 3 IoCs
Processor information is often read in order to detect sandboxing environments.
description ioc Process Key opened \REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0 ONENOTE.EXE Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz ONENOTE.EXE Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString ONENOTE.EXE - Enumerates system info in registry 2 TTPs 3 IoCs
description ioc Process Key opened \REGISTRY\MACHINE\Hardware\Description\System\BIOS ONENOTE.EXE Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily ONENOTE.EXE Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU ONENOTE.EXE - Modifies Control Panel 2 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-355097885-2402257403-2971294179-1000\Control Panel\Desktop lk.exe Set value (str) \REGISTRY\USER\S-1-5-21-355097885-2402257403-2971294179-1000\Control Panel\Desktop\WallpaperStyle = "10" lk.exe - Modifies registry class 5 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\.XQk8iLzOQ\ = "XQk8iLzOQ" lk.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\XQk8iLzOQ\DefaultIcon lk.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\XQk8iLzOQ lk.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\XQk8iLzOQ\DefaultIcon\ = "C:\\ProgramData\\XQk8iLzOQ.ico" lk.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\.XQk8iLzOQ lk.exe - Suspicious behavior: EnumeratesProcesses 64 IoCs
pid Process 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe 3592 lk.exe - Suspicious behavior: RenamesItself 26 IoCs
pid Process 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp 2576 F454.tmp - Suspicious use of AdjustPrivilegeToken 64 IoCs
description pid Process Token: SeAssignPrimaryTokenPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeDebugPrivilege 3592 lk.exe Token: 36 3592 lk.exe Token: SeImpersonatePrivilege 3592 lk.exe Token: SeIncBasePriorityPrivilege 3592 lk.exe Token: SeIncreaseQuotaPrivilege 3592 lk.exe Token: 33 3592 lk.exe Token: SeManageVolumePrivilege 3592 lk.exe Token: SeProfSingleProcessPrivilege 3592 lk.exe Token: SeRestorePrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeSystemProfilePrivilege 3592 lk.exe Token: SeTakeOwnershipPrivilege 3592 lk.exe Token: SeShutdownPrivilege 3592 lk.exe Token: SeDebugPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeBackupPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe Token: SeSecurityPrivilege 3592 lk.exe - Suspicious use of SetWindowsHookEx 13 IoCs
pid Process 4408 ONENOTE.EXE 4408 ONENOTE.EXE 4408 ONENOTE.EXE 4408 ONENOTE.EXE 4408 ONENOTE.EXE 4408 ONENOTE.EXE 4408 ONENOTE.EXE 4408 ONENOTE.EXE 4408 ONENOTE.EXE 4408 ONENOTE.EXE 4408 ONENOTE.EXE 4408 ONENOTE.EXE 4408 ONENOTE.EXE - Suspicious use of WriteProcessMemory 11 IoCs
description pid Process procid_target PID 3592 wrote to memory of 3832 3592 lk.exe 92 PID 3592 wrote to memory of 3832 3592 lk.exe 92 PID 4592 wrote to memory of 4408 4592 printfilterpipelinesvc.exe 97 PID 4592 wrote to memory of 4408 4592 printfilterpipelinesvc.exe 97 PID 3592 wrote to memory of 2576 3592 lk.exe 98 PID 3592 wrote to memory of 2576 3592 lk.exe 98 PID 3592 wrote to memory of 2576 3592 lk.exe 98 PID 3592 wrote to memory of 2576 3592 lk.exe 98 PID 2576 wrote to memory of 1720 2576 F454.tmp 99 PID 2576 wrote to memory of 1720 2576 F454.tmp 99 PID 2576 wrote to memory of 1720 2576 F454.tmp 99
Processes
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C:\Users\Admin\AppData\Local\Temp\lk.exe"C:\Users\Admin\AppData\Local\Temp\lk.exe"1⤵
- Drops desktop.ini file(s)
- Sets desktop wallpaper using registry
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Modifies Control Panel
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3592 -
C:\Windows\splwow64.exeC:\Windows\splwow64.exe 122882⤵
- Drops file in System32 directory
PID:3832
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C:\ProgramData\F454.tmp"C:\ProgramData\F454.tmp"2⤵
- Checks computer location settings
- Deletes itself
- Executes dropped EXE
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Suspicious behavior: RenamesItself
- Suspicious use of WriteProcessMemory
PID:2576 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /C DEL /F /Q C:\PROGRA~3\F454.tmp >> NUL3⤵
- System Location Discovery: System Language Discovery
PID:1720
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k PrintWorkflow -s PrintWorkflowUserSvc1⤵PID:1452
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C:\Windows\system32\printfilterpipelinesvc.exeC:\Windows\system32\printfilterpipelinesvc.exe -Embedding1⤵
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:4592 -
C:\Program Files\Microsoft Office\root\Office16\ONENOTE.EXE/insertdoc "C:\Users\Admin\AppData\Local\Microsoft\Windows\INetCache\{BFDC15FC-A67A-4CA2-892F-362B011859CD}.xps" 1336975358403100002⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious use of SetWindowsHookEx
PID:4408
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
- Path C:\$Recycle.Bin\S-1-5-21-355097885-2402257403-2971294179-1000\FFFFFFFFFFF
- Size 129B
- SHA256 708a2489a48aab4a3165c66e28189f81004f42097f5d34263894b7fc7acc677b
- MD5 176c155fcea5838f6dd3292c626d6e9f
- SHA1 0bf2ea631f732ebe9dda432ce9975703cb534f36
- SHA512 ab5bff05d09f560f20d1afc2d8aa94998cf40e1f5d5bc466c048e12ea3995b34e13a1696d482c6984b9c96ff5d4be639d1af5a97090a4b21640a63176374396a
- MD5 SHA1 SHA512
- Path C:\ProgramData\F454.tmp
- Size 14KB
- SHA256 917e115cc403e29b4388e0d175cbfac3e7e40ca1742299fbdb353847db2de7c2
- MD5 294e9f64cb1642dd89229fff0592856b
- SHA1 97b148c27f3da29ba7b18d6aee8a0db9102f47c9
- SHA512 b87d531890bf1577b9b4af41dddb2cdbbfa164cf197bd5987df3a3075983645a3acba443e289b7bfd338422978a104f55298fbfe346872de0895bde44adc89cf
- SSDEEP 384:5cFP7VtpK4p+31Mzh79W5vM+ZyUgGq4BtMvAxXCRsi:A7Vf9p+qQ02y5HW6kX
- MD5 SHA1 SHA512 SSDEEP
- Path C:\Users\Admin\AppData\Local\Temp\CCCCCC
- Size 146KB
- SHA256 ecf91b36bbaf3d5926a9a584e89d2d195f237b143959e9b7c81b7f54a39a9f20
- MD5 978f8c411ab60b61e3ce054577db62eb
- SHA1 2f860a61a67a10d5cf137f371f8ad45a6a1683ef
- SHA512 f4266ab735a70af96db70ab57b9ff523a6aa9670bb9f7c9ea22835c1022b66f626a9f1595fd622bd39232e52382eff500050ce503b1658eb85300a9826bbd31a
- SSDEEP 3072:bjTbXhMuw2ewaX7clacTjTbXhMuw2ewaX7clacTjTbXv:TbXIweclDbXIweclDbXv
- MD5 SHA1 SHA512 SSDEEP
- Path C:\Users\Admin\AppData\Local\Temp\{ABE4D48D-F722-4759-8E46-DD5D4FFBCDE1}
- Size 4KB
- SHA256 fa261727b20b8ac302906042f327f250cbaba2d6aeb4d48d216dac19625daeda
- MD5 dc039dee45de64901b900a71cbf84f1a
- SHA1 d9f51599741134681754fadb61b737bb383b5203
- SHA512 a66f89cbf7d16180deb866b5df6d59994ac48347a1a9c1631b5003fa7a5ffe361d8aca1e0659c5206791cc0ae6180c44b7e676b3dcc96d81fdc193204f27a89b
- SSDEEP 6:RaaYyfB3h1RRXUnfxS686FKk87p3Rujlw//0lweI/Sdp1Rujd:RaaYyf9/UfQDACwWf/SXo
- MD5 SHA1 SHA512 SSDEEP
- Path C:\XQk8iLzOQ.README.txt
- Size 343B
- SHA256 eb892eac9899b995047733bb17acd4945eb42b7b49f2ee8ad52b8026bc0297a7
- MD5 72b1ffaeb7de456483f491ecceadb088
- SHA1 ee1953abc295245ab01f35a4a823883826bf2b41
- SHA512 c0e7cad617cf1490bb25fc47936edc3ae164b190ed34f2d2a50e7e84ce6e0d6712a6ba9ab351cca1589266078326a00317516c53fecf96f20eaefe15e92ce445
- MD5 SHA1 SHA512
- Path F:\$RECYCLE.BIN\S-1-5-21-355097885-2402257403-2971294179-1000\DDDDDDDDDDD
- Size 129B
- SHA256 3f86385dec8d7ee12f4487b229601f3858b2bc8106fbac4b2f820889af686258
- MD5 2cab3deb3bf1df436e822be1f2d76242
- SHA1 1e788dbe6c46d7d5c0802c3a2d5d6598f6d4217c
- SHA512 e175ebc7e8fd5d637e9111cb99050770f3728e8a814ff5416ed96fd3b201837fcd8cf106ba96f9a27550593399f615cbe2b101686c51c0a1a2f3f4d111e2c21f
- MD5 SHA1 SHA512