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18/04/2024, 05:22
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240418-f2b6vade7x 7Analysis
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max time kernel
1791s -
max time network
1501s -
platform
windows11-21h2_x64 -
resource
win11-20240412-en -
resource tags
arch:x64arch:x86image:win11-20240412-enlocale:en-usos:windows11-21h2-x64system -
submitted
14/04/2024, 14:20
Static task
static1
Behavioral task
behavioral1
Sample
d351ac17dc0d9476ef029484a165f99e258f546bba2d619b1c6485cb8875ac7a.exe
Resource
win7-20240215-en
Behavioral task
behavioral2
Sample
d351ac17dc0d9476ef029484a165f99e258f546bba2d619b1c6485cb8875ac7a.exe
Resource
win10-20240404-en
Behavioral task
behavioral3
Sample
d351ac17dc0d9476ef029484a165f99e258f546bba2d619b1c6485cb8875ac7a.exe
Resource
win10v2004-20240226-en
Behavioral task
behavioral4
Sample
d351ac17dc0d9476ef029484a165f99e258f546bba2d619b1c6485cb8875ac7a.exe
Resource
win11-20240412-en
General
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Target
d351ac17dc0d9476ef029484a165f99e258f546bba2d619b1c6485cb8875ac7a.exe
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Size
371KB
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MD5
bb8cd5df2be7e8bcc5be439675b3d0a2
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SHA1
627ac60f64974d5caaf81c2de8ca0977c91f4219
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SHA256
d351ac17dc0d9476ef029484a165f99e258f546bba2d619b1c6485cb8875ac7a
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SHA512
57031eb7d7b2c27d7ecacdc085d07065ced46a742128f9818f62c9fe6633c31aa8eb20ffc52c8415613787946060f5a6b5adf8b977d5ca4fed9656233ebd9cfa
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SSDEEP
6144:tnzQnu/cmM1oSigOQT2F8U92Iu7DMVQZhWLvLRXdYX9ji+uhi2PsrhY:hzQnkM1oSiBGI8bxn5m6i+uo20tY
Malware Config
Extracted
C:\Users\Admin\AppData\Local\Packages\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\LocalState\ConstraintIndex\Apps_{6caeb36c-12fd-45ab-8e18-7a0f0ca471ef}\_DECRYPT_INFO_arql.html
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'>
http-equiv='Content-Type
Extracted
C:\_DECRYPT_INFO_arql.html
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'>
http-equiv='Content-Type
Extracted
C:\ProgramData\Package Cache\{61087a79-ac85-455c-934d-1fa22cc64f36}\_DECRYPT_INFO_arql.html
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'>
http-equiv='Content-Type
Signatures
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Maktub Locker
Advanced ransomware family capable of offline decryption, generally distributed via .scr email attachments.
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Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
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Renames multiple (227) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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ACProtect 1.3x - 1.4x DLL software 3 IoCs
Detects file using ACProtect software.
resource yara_rule behavioral4/memory/2508-52-0x0000000003B00000-0x0000000003B08000-memory.dmp acprotect behavioral4/memory/2508-56-0x0000000003B00000-0x0000000003B08000-memory.dmp acprotect behavioral4/memory/2508-55-0x0000000003B00000-0x0000000003B08000-memory.dmp acprotect -
Uses Tor communications 1 TTPs
Malware can proxy its traffic through Tor for more anonymity.
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Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Checks processor information in registry 2 TTPs 3 IoCs
Processor information is often read in order to detect sandboxing environments.
description ioc Process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString WINWORD.EXE Key opened \REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0 WINWORD.EXE Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz WINWORD.EXE -
Enumerates system info in registry 2 TTPs 3 IoCs
description ioc Process Key opened \REGISTRY\MACHINE\Hardware\Description\System\BIOS WINWORD.EXE Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily WINWORD.EXE Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU WINWORD.EXE -
Interacts with shadow copies 2 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 3356 vssadmin.exe -
Modifies registry class 1 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-4041115548-3858121278-1660933110-1000_Classes\Local Settings d351ac17dc0d9476ef029484a165f99e258f546bba2d619b1c6485cb8875ac7a.exe -
Suspicious behavior: AddClipboardFormatListener 2 IoCs
pid Process 2600 WINWORD.EXE 2600 WINWORD.EXE -
Suspicious behavior: EnumeratesProcesses 2 IoCs
pid Process 2508 d351ac17dc0d9476ef029484a165f99e258f546bba2d619b1c6485cb8875ac7a.exe 2508 d351ac17dc0d9476ef029484a165f99e258f546bba2d619b1c6485cb8875ac7a.exe -
Suspicious use of AdjustPrivilegeToken 3 IoCs
description pid Process Token: SeBackupPrivilege 4968 vssvc.exe Token: SeRestorePrivilege 4968 vssvc.exe Token: SeAuditPrivilege 4968 vssvc.exe -
Suspicious use of SetWindowsHookEx 7 IoCs
pid Process 2600 WINWORD.EXE 2600 WINWORD.EXE 2600 WINWORD.EXE 2600 WINWORD.EXE 2600 WINWORD.EXE 2600 WINWORD.EXE 2600 WINWORD.EXE -
Suspicious use of WriteProcessMemory 4 IoCs
description pid Process procid_target PID 2508 wrote to memory of 2600 2508 d351ac17dc0d9476ef029484a165f99e258f546bba2d619b1c6485cb8875ac7a.exe 84 PID 2508 wrote to memory of 2600 2508 d351ac17dc0d9476ef029484a165f99e258f546bba2d619b1c6485cb8875ac7a.exe 84 PID 2508 wrote to memory of 3356 2508 d351ac17dc0d9476ef029484a165f99e258f546bba2d619b1c6485cb8875ac7a.exe 95 PID 2508 wrote to memory of 3356 2508 d351ac17dc0d9476ef029484a165f99e258f546bba2d619b1c6485cb8875ac7a.exe 95 -
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\d351ac17dc0d9476ef029484a165f99e258f546bba2d619b1c6485cb8875ac7a.exe"C:\Users\Admin\AppData\Local\Temp\d351ac17dc0d9476ef029484a165f99e258f546bba2d619b1c6485cb8875ac7a.exe"1⤵
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2508 -
C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE"C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE" /n "C:\Users\Admin\AppData\Local\Temp\d351ac17dc0d9476ef029484a165f99e258f546bba2d619b1c6485cb8875ac7a.rtf" /o ""2⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
PID:2600
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C:\Windows\SYSTEM32\vssadmin.exevssadmin.exe delete shadows /all /quiet2⤵
- Interacts with shadow copies
PID:3356
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4968
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
12KB
MD58af17b9ee758f1aae1da401e81b38f4a
SHA1a1123cf66523434344791a829ee020f85af618fa
SHA256f583beefe5cd19af56c539ed615fb8355e8e3a36675edfa824067590d4a08900
SHA512e85ede0ff310a0c0c84b41de8b236e2b88938e28f8c8a1641d88e52c4bc5469fbe7a41206f9bea39c52577cf4721ba133f08e9ab95551a33b53856937e459168
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C:\Users\Admin\AppData\Local\Packages\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\LocalState\ConstraintIndex\Apps_{6caeb36c-12fd-45ab-8e18-7a0f0ca471ef}\_DECRYPT_INFO_arql.html
Filesize12KB
MD5aee325088034e1351d02f1646a341c54
SHA158597375b0e9ca1f00bf4593e7165881d024f8fe
SHA256855ad7d662a1b8afe6a66d1969fb848573f9ee59751fe210b14fafb51a7b899f
SHA512fce1027fd1b237fc3b169ce6115ce89a4c0ed9589b843e93a3f5d637b7975fa1886a241b3a530729443c65f5cadaaeeb17394489888592a6d316ed62feaf79dd
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Filesize
262KB
MD551d32ee5bc7ab811041f799652d26e04
SHA1412193006aa3ef19e0a57e16acf86b830993024a
SHA2566230814bf5b2d554397580613e20681752240ab87fd354ececf188c1eabe0e97
SHA5125fc5d889b0c8e5ef464b76f0c4c9e61bda59b2d1205ac9417cc74d6e9f989fb73d78b4eb3044a1a1e1f2c00ce1ca1bd6d4d07eeadc4108c7b124867711c31810
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C:\Users\Admin\AppData\Local\Temp\d351ac17dc0d9476ef029484a165f99e258f546bba2d619b1c6485cb8875ac7a.rtf
Filesize4KB
MD52d5020c82de674b48cfd17cc20fcbba2
SHA14e317eaeebd839ee5f6eb3925a9fbee819c5349c
SHA256120becd55248f4a2ccbbc99ba9d3c2932223264a95cd72e9ae7568be61277e9a
SHA512ffbbdda009237d6825f6cd6f751a41f4f9d716186901ffdbeed56c2d1410245771decd07f591cf56cafdd4bbebd4e4c74f009ff15736d5321635e34ff17d0d8d
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Filesize
12KB
MD512c3beb802629ab58275cbc053264677
SHA1697fa7aceacf2b687e600ee86a57d70391bd55d7
SHA25603bd42ffc19c98164ae8a72a631af113aa925bed83af40ce1c81b4991a42e95b
SHA512ffb61fd17f56c9d1682f2196e24302f406a076aeb5c0702da401ea209440bf2f473c0715065b19b9aa2a2e8bffcb68210c6afb42abdfdd1b4e959dee7a938083