Analysis
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max time kernel
148s -
max time network
150s -
platform
windows10-2004_x64 -
resource
win10v2004-20231222-en -
resource tags
arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system -
submitted
12-02-2024 20:02
Static task
static1
Behavioral task
behavioral1
Sample
2024-02-12_6f9bdcded005cf7c07ad4ec72a6fe3a8_cryptolocker.exe
Resource
win7-20231129-en
Behavioral task
behavioral2
Sample
2024-02-12_6f9bdcded005cf7c07ad4ec72a6fe3a8_cryptolocker.exe
Resource
win10v2004-20231222-en
General
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Target
2024-02-12_6f9bdcded005cf7c07ad4ec72a6fe3a8_cryptolocker.exe
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Size
42KB
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MD5
6f9bdcded005cf7c07ad4ec72a6fe3a8
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SHA1
ef9823df0d6345553d47f27e9ac78cb49cc7c4e9
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SHA256
b17005019f573d087868a1d9413bc7c4922d437ec1a0586369a860b4a058885b
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SHA512
80ad76e05e0f5a358039a9b849eb59217ce4624a234ea53a4fe5a904cd46eba85de1483ea534436a3ee6e36a9c902c9eae7464d8c70477c2bbf47dc4ef2caa7f
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SSDEEP
768:b7o/2n1TCraU6GD1a4X0WcO+wMVm+slAMpheh:bc/y2lkF0+Be0
Malware Config
Signatures
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Detection of CryptoLocker Variants 1 IoCs
Processes:
resource yara_rule C:\Users\Admin\AppData\Local\Temp\rewok.exe CryptoLocker_rule2 -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
2024-02-12_6f9bdcded005cf7c07ad4ec72a6fe3a8_cryptolocker.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-1168293393-3419776239-306423207-1000\Control Panel\International\Geo\Nation 2024-02-12_6f9bdcded005cf7c07ad4ec72a6fe3a8_cryptolocker.exe -
Executes dropped EXE 1 IoCs
Processes:
rewok.exepid process 2728 rewok.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Suspicious use of WriteProcessMemory 3 IoCs
Processes:
2024-02-12_6f9bdcded005cf7c07ad4ec72a6fe3a8_cryptolocker.exedescription pid process target process PID 4504 wrote to memory of 2728 4504 2024-02-12_6f9bdcded005cf7c07ad4ec72a6fe3a8_cryptolocker.exe rewok.exe PID 4504 wrote to memory of 2728 4504 2024-02-12_6f9bdcded005cf7c07ad4ec72a6fe3a8_cryptolocker.exe rewok.exe PID 4504 wrote to memory of 2728 4504 2024-02-12_6f9bdcded005cf7c07ad4ec72a6fe3a8_cryptolocker.exe rewok.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-02-12_6f9bdcded005cf7c07ad4ec72a6fe3a8_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-02-12_6f9bdcded005cf7c07ad4ec72a6fe3a8_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\rewok.exe"C:\Users\Admin\AppData\Local\Temp\rewok.exe"2⤵
- Executes dropped EXE
Network
MITRE ATT&CK Matrix ATT&CK v13
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Local\Temp\rewok.exeFilesize
42KB
MD56ccb1df9302bc852cf0c48d2d0851ca4
SHA1a0cde5b35e2adbd2e5019285e15b2b945a148ea0
SHA256d359b99494006b8cfbe750e74dd6240fc824614f7d372bf973eb13f570fa1975
SHA512b24c1b1ed0eee96540bd7d1b0872ac4c7735fd487fd0593249e54c11eef65799bc79fe0b82bbed4dd656919a6432a5d0d6887ede9dfa2f9c50c5f1e938e495a2
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memory/2728-21-0x0000000002110000-0x0000000002116000-memory.dmpFilesize
24KB
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memory/4504-0-0x0000000002250000-0x0000000002256000-memory.dmpFilesize
24KB
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memory/4504-1-0x0000000002250000-0x0000000002256000-memory.dmpFilesize
24KB
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memory/4504-2-0x0000000000400000-0x0000000000406000-memory.dmpFilesize
24KB