Analysis
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max time kernel
150s -
max time network
150s -
platform
windows10-2004_x64 -
resource
win10v2004-20240419-en -
resource tags
arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system -
submitted
01/05/2024, 12:35
Behavioral task
behavioral1
Sample
2024-05-01_7d58c8fe2a93d5744e306a3b2285a82d_cryptolocker.exe
Resource
win7-20240215-en
Behavioral task
behavioral2
Sample
2024-05-01_7d58c8fe2a93d5744e306a3b2285a82d_cryptolocker.exe
Resource
win10v2004-20240419-en
General
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Target
2024-05-01_7d58c8fe2a93d5744e306a3b2285a82d_cryptolocker.exe
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Size
68KB
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MD5
7d58c8fe2a93d5744e306a3b2285a82d
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SHA1
7d3c1584f176e6e06a460237b26526eead734d2e
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SHA256
9b28bee49b5a004902959c29f81726aa22c925eb66c8fd9c123959bae08c6006
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SHA512
29d2e66f34fbb488f64b8dcc598dfa50ddf67e6920a7541dfb475c6f388807e1bbe8e044c40d12b07cf0d1230b600d79f499eb863af3e7cc300d239c50d6d37c
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SSDEEP
768:quVbxjgQNQXtckstOOtEvwDpjAaDOK6PsED3VK2+ZtyOjgO4r9vFAg2rq6W1A1PF:quJu9cvMOtEvwDpjWYTjipvF2bx1PQAF
Malware Config
Signatures
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Detection of CryptoLocker Variants 5 IoCs
resource yara_rule behavioral2/memory/3900-0-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_rule2 behavioral2/files/0x000d000000023ace-13.dat CryptoLocker_rule2 behavioral2/memory/3900-17-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_rule2 behavioral2/memory/816-18-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_rule2 behavioral2/memory/816-27-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 5 IoCs
resource yara_rule behavioral2/memory/3900-0-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_set1 behavioral2/files/0x000d000000023ace-13.dat CryptoLocker_set1 behavioral2/memory/3900-17-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_set1 behavioral2/memory/816-18-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_set1 behavioral2/memory/816-27-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_set1 -
UPX dump on OEP (original entry point) 5 IoCs
resource yara_rule behavioral2/memory/3900-0-0x0000000000500000-0x000000000050F000-memory.dmp UPX behavioral2/files/0x000d000000023ace-13.dat UPX behavioral2/memory/3900-17-0x0000000000500000-0x000000000050F000-memory.dmp UPX behavioral2/memory/816-18-0x0000000000500000-0x000000000050F000-memory.dmp UPX behavioral2/memory/816-27-0x0000000000500000-0x000000000050F000-memory.dmp UPX -
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-1-5-21-17203666-93769886-2545153620-1000\Control Panel\International\Geo\Nation 2024-05-01_7d58c8fe2a93d5744e306a3b2285a82d_cryptolocker.exe -
Executes dropped EXE 1 IoCs
pid Process 816 asih.exe -
resource yara_rule behavioral2/memory/3900-0-0x0000000000500000-0x000000000050F000-memory.dmp upx behavioral2/files/0x000d000000023ace-13.dat upx behavioral2/memory/3900-17-0x0000000000500000-0x000000000050F000-memory.dmp upx behavioral2/memory/816-18-0x0000000000500000-0x000000000050F000-memory.dmp upx behavioral2/memory/816-27-0x0000000000500000-0x000000000050F000-memory.dmp upx -
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
description pid Process procid_target PID 3900 wrote to memory of 816 3900 2024-05-01_7d58c8fe2a93d5744e306a3b2285a82d_cryptolocker.exe 85 PID 3900 wrote to memory of 816 3900 2024-05-01_7d58c8fe2a93d5744e306a3b2285a82d_cryptolocker.exe 85 PID 3900 wrote to memory of 816 3900 2024-05-01_7d58c8fe2a93d5744e306a3b2285a82d_cryptolocker.exe 85
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-05-01_7d58c8fe2a93d5744e306a3b2285a82d_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-05-01_7d58c8fe2a93d5744e306a3b2285a82d_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3900 -
C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
PID:816
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
69KB
MD592c6917fa8adede4d41313c1596d745e
SHA16e65fd83a99ff68c1dcbc9ba2b72a4dab094bc7d
SHA25628ae2ec220c3dc0f71d8ea78e77997b80168c28b8150b6c6dc5c4d28d4836415
SHA512b769cc0344bd0b5af8c35e9653d2293d1c25259791dc6bd21e07ef108fdb02b916f792a22963d8521385dee0702fa9ec35fef3cb4719d0e79ad8483db835c0b3