Analysis
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max time kernel
149s -
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
04-05-2024 03:33
Behavioral task
behavioral1
Sample
2024-05-04_759ad7e953c6ee287297b1a1ec0dd9f6_cryptolocker.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
2024-05-04_759ad7e953c6ee287297b1a1ec0dd9f6_cryptolocker.exe
Resource
win10v2004-20240419-en
General
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Target
2024-05-04_759ad7e953c6ee287297b1a1ec0dd9f6_cryptolocker.exe
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Size
38KB
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MD5
759ad7e953c6ee287297b1a1ec0dd9f6
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SHA1
1d5cdbe9393d68e1921554a705dce20a0f791b74
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SHA256
ba43f06baed4281bb97e7d9bc1a7a0ec8c4efc3e0f189b297fd52d9ada8f3807
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SHA512
c4d55e0144f1e62695287bccc75a4576ae068bb4b78b2e737a1ae10ec857063a2f487d16d145a9ac6dfd645ada268ad62d97b2bfa6d61dbe447432f5d89149a9
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SSDEEP
768:q7PdFecFS5agQtOOtEvwDpjeMLZdzuqpXsiE8Wq/DpkITYan3:qDdFJy3QMOtEvwDpjjWMl7Tdn3
Malware Config
Signatures
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Detection of CryptoLocker Variants 4 IoCs
resource yara_rule behavioral2/memory/1336-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/files/0x000d000000023b2a-13.dat CryptoLocker_rule2 behavioral2/memory/1336-18-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/memory/4588-27-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 4 IoCs
resource yara_rule behavioral2/memory/1336-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/files/0x000d000000023b2a-13.dat CryptoLocker_set1 behavioral2/memory/1336-18-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/memory/4588-27-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 -
UPX dump on OEP (original entry point) 4 IoCs
resource yara_rule behavioral2/memory/1336-0-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/files/0x000d000000023b2a-13.dat UPX behavioral2/memory/1336-18-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/memory/4588-27-0x0000000000500000-0x0000000000510000-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-1-5-21-2860750803-256193626-1801997576-1000\Control Panel\International\Geo\Nation 2024-05-04_759ad7e953c6ee287297b1a1ec0dd9f6_cryptolocker.exe -
Executes dropped EXE 1 IoCs
pid Process 4588 asih.exe -
resource yara_rule behavioral2/memory/1336-0-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/files/0x000d000000023b2a-13.dat upx behavioral2/memory/1336-18-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/memory/4588-27-0x0000000000500000-0x0000000000510000-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 1336 wrote to memory of 4588 1336 2024-05-04_759ad7e953c6ee287297b1a1ec0dd9f6_cryptolocker.exe 83 PID 1336 wrote to memory of 4588 1336 2024-05-04_759ad7e953c6ee287297b1a1ec0dd9f6_cryptolocker.exe 83 PID 1336 wrote to memory of 4588 1336 2024-05-04_759ad7e953c6ee287297b1a1ec0dd9f6_cryptolocker.exe 83
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-05-04_759ad7e953c6ee287297b1a1ec0dd9f6_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-05-04_759ad7e953c6ee287297b1a1ec0dd9f6_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1336 -
C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
PID:4588
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
38KB
MD51d5acb7031957b805df3020d3c3f2d40
SHA1634384df590329e5c4c28f2cafd38d5a553754e3
SHA256753d45670c78337cb17ea277922ba4864dad29a07ab0fb2c5a8950c03723f049
SHA51229b604753ee2a6aef12dc1ab2711f3a201f73c7bb9c784e259d6a29ae33c0c3c2d0969016c74fe1c85b2418c3282f1f0348ccc622acda9650e8f1cdaaa0dc2a1