0b432f20d54647f077811ecb1df4dbc64fb17fbd6a9e0cce4ac9437d5f7891fb

Resubmissions

18-03-2024 22:36

240318-2h9hwsba88 10

Analysis

max time kernel
1782s
max time network
1456s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
18-03-2024 22:36

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General

Target

Ransomware/Krotten.exe
Size

53KB
MD5

87ccd6f4ec0e6b706d65550f90b0e3c7
SHA1

213e6624bff6064c016b9cdc15d5365823c01f5f
SHA256

e79f164ccc75a5d5c032b4c5a96d6ad7604faffb28afe77bc29b9173fa3543e4
SHA512

a72403d462e2e2e181dbdabfcc02889f001387943571391befed491aaecba830b0869bdd4d82bca137bd4061bbbfb692871b1b4622c4a7d9f16792c60999c990
SSDEEP

768:4yKoNLsn4Jp9ZvRInygrpMoZN+WtOl08jxBEHCDwBLpZTPCUvQK:j/sn4/OycxZN+MKxp8t9zQK

Score

8^/10

evasion persistence

Malware Config

Signatures

Disables RegEdit via registry modification 2 IoCs

evasion

Processes:

Krotten.exe

description	ioc	process
Set value (int)	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	Krotten.exe

Disables Task Manager via registry modification
evasion

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

Krotten.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\svchost = "C:\\WINDOWS\\Web\\rundll32.exe"	Krotten.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\AVPCC = "C:\\WINDOWS\\Cursors\\avp.exe"	Krotten.exe

Modifies WinLogon 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

Processes:

Krotten.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\LegalNoticeCaption = "DANGER"	Krotten.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\LegalNoticeText = "Äëÿ òîãî ÷òîáû âîññòàíîâèòü íîðìàëüíóþ ðàáîòó ñâîåãî êîìïüþòåðà íå ïîòåðÿâ ÂÑÞ èíôîðìàöèþ! È ñ ýêîíîìèâ äåíüãè, ïðèøëè ìíå íà e-mail wordsia@notrix.de êîä ïîïîëíåíèÿ ñ÷åòà êèåâñòàð íà 25 ãðèâåíü. Â îòâåò â òå÷åíèå äâåíàäöàòè ÷àñîâ íà ñâîé e-mail òû ïîëó÷èøü ôàèë äëÿ óäàëåíèÿ ýòîé ïðîãðàììû."	Krotten.exe

Drops file in Windows directory 1 IoCs

Processes:

Krotten.exe

description ioc process

File opened for modification C:\WINDOWS\Web Krotten.exe

description	ioc	process
File opened for modification	C:\WINDOWS\Web	Krotten.exe

Modifies Control Panel 6 IoCs

evasion

Processes:

Krotten.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\Desktop	Krotten.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\Desktop\WallpaperOriginX = "210"	Krotten.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\Desktop\WallpaperOriginY = "187"	Krotten.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\Desktop\MenuShowDelay = "9999"	Krotten.exe
Key created	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\International	Krotten.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\International\sTimeFormat = "ÕÓÉ"	Krotten.exe

Modifies Internet Explorer settings 1 TTPs 4 IoCs

adware spyware

Modify Registry

T1112

Processes:

Krotten.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Internet Explorer\Main\Window title = ":::::::::::::::::: ÌÎÉ ÕÓÉ ÏÐÎÒÓÕ À ÏÈÇÄÀ ÃÍÈÅÒ ::::::::::::::::::"	Krotten.exe
Key created	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Software\Microsoft\Internet Explorer\Main	Krotten.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\SOFTWARE\Microsoft\Internet Explorer\Main\Window title = ":::::::::::::::::: ÌÎÉ ÕÓÉ ÏÐÎÒÓÕ À ÏÈÇÄÀ ÃÍÈÅÒ ::::::::::::::::::"	Krotten.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Internet Explorer\Main	Krotten.exe

Modifies Internet Explorer start page 1 TTPs 2 IoCs

stealer

Modify Registry

T1112

Processes:

Krotten.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Internet Explorer\Main\Start Page = "http://poetry.rotten.com/lightning/"	Krotten.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\SOFTWARE\Microsoft\Internet Explorer\Main\Start Page = "http://poetry.rotten.com/lightning/"	Krotten.exe

Modifies registry class 1 IoCs

Processes:

Krotten.exe

description ioc process

Key deleted \REGISTRY\MACHINE\SOFTWARE\CLASSES\REGFILE\SHELL\OPEN\COMMAND Krotten.exe

description	ioc	process
Key deleted	\REGISTRY\MACHINE\SOFTWARE\CLASSES\REGFILE\SHELL\OPEN\COMMAND	Krotten.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

Krotten.exesvchost.exe

description	pid	process
Token: SeSystemtimePrivilege	1776	Krotten.exe
Token: SeSystemtimePrivilege	1776	Krotten.exe
Token: SeSystemtimePrivilege	1776	Krotten.exe
Token: SeManageVolumePrivilege	2008	svchost.exe

System policy modification 1 TTPs 37 IoCs

evasion

Modify Registry

T1112

Processes:

Krotten.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoStartMenuPinnedList = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoSMMyDocs = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoActiveDesktop = "1"	Krotten.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Uninstall	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoStartMenuMFUprogramsList = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoStartMenuSubFolders = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoCommonGroups = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoViewOnDrive = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoLogOff = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoClose = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoThemesTab = "1"	Krotten.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\NonEnum	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoSMMyPictures = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoDrives = "1044"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoSaveSettings = "1"	Krotten.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoUserNameInStartMenu = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoSMHelp = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoPrinterTabs = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoPrinters = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\NonEnum\{20D04FE0-3AEA-1069-A2D8-08002B30309D} = "1"	Krotten.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoStartMenuMyMusic = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoControlPanel = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoRecentDocsMenu = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoNetHood = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Uninstall\NoAddRemovePrograms = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoFind = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoRun = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\NonEnum\{450D8FBA-AD25-11D0-98A8-0800361B1103} = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\NoDispCPL = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableTaskMgr = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoDesktop = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoFavoritesMenu = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoToolbarCustomize = "1"	Krotten.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoManageMyComputerVerb = "1"	Krotten.exe

C:\Users\Admin\AppData\Local\Temp\Ransomware\Krotten.exe
"C:\Users\Admin\AppData\Local\Temp\Ransomware\Krotten.exe"
1⤵
- Disables RegEdit via registry modification
- Adds Run key to start application
- Modifies WinLogon
- Drops file in Windows directory
- Modifies Control Panel
- Modifies Internet Explorer settings
- Modifies Internet Explorer start page
- Modifies registry class
- Suspicious use of AdjustPrivilegeToken
- System policy modification
PID:1776

C:\Windows\system32\rundll32.exe
"C:\Windows\system32\rundll32.exe" "C:\Windows\SYSTEM32\EDGEHTML.dll",#141 Microsoft.VCLibs.140.00_8wekyb3d8bbwe
1⤵
PID:4856

C:\Windows\System32\svchost.exe
C:\Windows\System32\svchost.exe -k UnistackSvcGroup
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2008

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

memory/2008-0-0x000001B7ED840000-0x000001B7ED850000-memory.dmp

Filesize
64KB

Download
memory/2008-16-0x000001B7ED940000-0x000001B7ED950000-memory.dmp

Filesize
64KB

Download
memory/2008-32-0x000001B7F5CB0000-0x000001B7F5CB1000-memory.dmp

Filesize
4KB

Download
memory/2008-34-0x000001B7F5CE0000-0x000001B7F5CE1000-memory.dmp

Filesize
4KB

Download
memory/2008-35-0x000001B7F5CE0000-0x000001B7F5CE1000-memory.dmp

Filesize
4KB

Download
memory/2008-36-0x000001B7F5DF0000-0x000001B7F5DF1000-memory.dmp

Filesize
4KB

Download