Analysis
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max time kernel
100s -
max time network
102s -
platform
windows10-2004_x64 -
resource
win10v2004-20240508-en -
resource tags
arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system -
submitted
31-05-2024 03:11
Behavioral task
behavioral1
Sample
KVRT.exe
Resource
win7-20240215-en
Behavioral task
behavioral2
Sample
KVRT.exe
Resource
win10v2004-20240508-en
Errors
General
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Target
KVRT.exe
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Size
95KB
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MD5
caacc00a3a1be01e99f29abcf5f242c4
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SHA1
2605c5337c15fda32deafe27d49baf34ab892561
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SHA256
209e122072c202f0e7663407dbfb6c99774360ee736fcaad8a6998adbb06224e
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SHA512
3ca0c64f573bb07b2b93ec2bbffe9684bbc6e764f0ab07d716d1d035897aaf0c6d71444e569deb28ef57067717b30f52b20eba5176c657fe0c69746778d852e1
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SSDEEP
1536:ayKsbRFiE6iZdEOOQ/hAyBxbBTNk34Y6yRNZpqHOy+guV5V:dPRp6bPQG4xbB44gZgHOy+F5V
Malware Config
Extracted
xworm
127.0.0.1:40971
us3.localto.net:40971
Name1442-40971.portmap.host:40971
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Install_directory
%Temp%
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install_file
KVRT.exe
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telegram
https://api.telegram.org/bot6916721041:AAGsGXyaplDWQ9HJlE88Z36KtBFClSB3E20
Signatures
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Detect Xworm Payload 1 IoCs
Processes:
resource yara_rule behavioral2/memory/4632-0-0x0000000000BF0000-0x0000000000C0E000-memory.dmp family_xworm -
Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs
Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.
Processes:
powershell.exepowershell.exepowershell.exepowershell.exepid process 2992 powershell.exe 1256 powershell.exe 3920 powershell.exe 3692 powershell.exe -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
KVRT.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\Control Panel\International\Geo\Nation KVRT.exe -
Drops startup file 2 IoCs
Processes:
KVRT.exedescription ioc process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\KVRT.lnk KVRT.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\KVRT.lnk KVRT.exe -
Adds Run key to start application 2 TTPs 1 IoCs
Processes:
KVRT.exedescription ioc process Set value (str) \REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\KVRT = "C:\\Users\\Admin\\AppData\\Local\\Temp\\KVRT.exe" KVRT.exe -
Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
Processes:
flow ioc 29 ip-api.com -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
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Modifies data under HKEY_USERS 15 IoCs
Processes:
LogonUI.exedescription ioc process Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0" LogonUI.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271" LogonUI.exe Set value (data) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00 LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271" LogonUI.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "233" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1" LogonUI.exe -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
Processes:
KVRT.exepid process 4632 KVRT.exe -
Suspicious behavior: EnumeratesProcesses 10 IoCs
Processes:
powershell.exepowershell.exepowershell.exepowershell.exeKVRT.exepid process 2992 powershell.exe 2992 powershell.exe 2992 powershell.exe 1256 powershell.exe 1256 powershell.exe 3920 powershell.exe 3920 powershell.exe 3692 powershell.exe 3692 powershell.exe 4632 KVRT.exe -
Suspicious use of AdjustPrivilegeToken 10 IoCs
Processes:
KVRT.exepowershell.exepowershell.exepowershell.exepowershell.exeKVRT.exeKVRT.exeshutdown.exedescription pid process Token: SeDebugPrivilege 4632 KVRT.exe Token: SeDebugPrivilege 2992 powershell.exe Token: SeDebugPrivilege 1256 powershell.exe Token: SeDebugPrivilege 3920 powershell.exe Token: SeDebugPrivilege 3692 powershell.exe Token: SeDebugPrivilege 4632 KVRT.exe Token: SeDebugPrivilege 576 KVRT.exe Token: SeDebugPrivilege 1788 KVRT.exe Token: SeShutdownPrivilege 3108 shutdown.exe Token: SeRemoteShutdownPrivilege 3108 shutdown.exe -
Suspicious use of SetWindowsHookEx 2 IoCs
Processes:
KVRT.exeLogonUI.exepid process 4632 KVRT.exe 1472 LogonUI.exe -
Suspicious use of WriteProcessMemory 12 IoCs
Processes:
KVRT.exedescription pid process target process PID 4632 wrote to memory of 2992 4632 KVRT.exe powershell.exe PID 4632 wrote to memory of 2992 4632 KVRT.exe powershell.exe PID 4632 wrote to memory of 1256 4632 KVRT.exe powershell.exe PID 4632 wrote to memory of 1256 4632 KVRT.exe powershell.exe PID 4632 wrote to memory of 3920 4632 KVRT.exe powershell.exe PID 4632 wrote to memory of 3920 4632 KVRT.exe powershell.exe PID 4632 wrote to memory of 3692 4632 KVRT.exe powershell.exe PID 4632 wrote to memory of 3692 4632 KVRT.exe powershell.exe PID 4632 wrote to memory of 4484 4632 KVRT.exe schtasks.exe PID 4632 wrote to memory of 4484 4632 KVRT.exe schtasks.exe PID 4632 wrote to memory of 3108 4632 KVRT.exe shutdown.exe PID 4632 wrote to memory of 3108 4632 KVRT.exe shutdown.exe -
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\KVRT.exe"C:\Users\Admin\AppData\Local\Temp\KVRT.exe"1⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4632 -
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\KVRT.exe'2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2992
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'KVRT.exe'2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1256
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\KVRT.exe'2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3920
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'KVRT.exe'2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3692
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C:\Windows\System32\schtasks.exe"C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "KVRT" /tr "C:\Users\Admin\AppData\Local\Temp\KVRT.exe"2⤵
- Creates scheduled task(s)
PID:4484
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C:\Windows\SYSTEM32\shutdown.exeshutdown.exe /f /s /t 02⤵
- Suspicious use of AdjustPrivilegeToken
PID:3108
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C:\Users\Admin\AppData\Local\Temp\KVRT.exeC:\Users\Admin\AppData\Local\Temp\KVRT.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:576
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C:\Users\Admin\AppData\Local\Temp\KVRT.exeC:\Users\Admin\AppData\Local\Temp\KVRT.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1788
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C:\Windows\system32\LogonUI.exe"LogonUI.exe" /flags:0x4 /state0:0xa3901055 /state1:0x41c64e6d1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:1472
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
654B
MD52ff39f6c7249774be85fd60a8f9a245e
SHA1684ff36b31aedc1e587c8496c02722c6698c1c4e
SHA256e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced
SHA5121d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1
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Filesize
2KB
MD5d85ba6ff808d9e5444a4b369f5bc2730
SHA131aa9d96590fff6981b315e0b391b575e4c0804a
SHA25684739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f
SHA5128c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249
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Filesize
944B
MD577d622bb1a5b250869a3238b9bc1402b
SHA1d47f4003c2554b9dfc4c16f22460b331886b191b
SHA256f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb
SHA512d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9
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Filesize
944B
MD510890cda4b6eab618e926c4118ab0647
SHA11e1d63b73a0e6c7575f458b3c7917a9ce5ba776d
SHA25600f8a035324d39bd62e6dee5e1b480069015471c487ebee4479e6990ea9ddb14
SHA512a2ee84006c24a36f25e0bca0772430d64e3791f233da916aecdeae6712763e77d55bbbd00dc8f6b2b3887f3c26ab3980b96c5f46cc823e81e28abbbc5fc78221
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Filesize
944B
MD5120c6c9af4de2accfcff2ed8c3aab1af
SHA1504f64ae4ac9c4fe308a6a50be24fe464f3dad95
SHA256461315e4057c3fa4d0031df3f7e6511914f082698b6c41f5c2ada831ceffb222
SHA512041712168718dff702da8203b4089b2e57db98ce503b8ecf36809dec0cd7a595a0d427caa960bc1bd29cbedc85ad3262773f2077a476b85aca387d48f7b07ba2
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Filesize
60B
MD5d17fe0a3f47be24a6453e9ef58c94641
SHA16ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA25696ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA5125b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82