Analysis
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max time kernel
150s -
max time network
150s -
platform
windows10-2004_x64 -
resource
win10v2004-20240508-en -
resource tags
arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system -
submitted
12/06/2024, 18:49
Behavioral task
behavioral1
Sample
2024-06-12_ef1b6f05471066e3ef54f455a29d79a1_cryptolocker.exe
Resource
win7-20240508-en
Behavioral task
behavioral2
Sample
2024-06-12_ef1b6f05471066e3ef54f455a29d79a1_cryptolocker.exe
Resource
win10v2004-20240508-en
General
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Target
2024-06-12_ef1b6f05471066e3ef54f455a29d79a1_cryptolocker.exe
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Size
40KB
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MD5
ef1b6f05471066e3ef54f455a29d79a1
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SHA1
6c9f4edb3675eac79587918e360162e01af22e28
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SHA256
109c476e7029a7f6f3423c5ed4af67b8992ad73a4f92ebc38451b5e8b0341437
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SHA512
eb7ad306a1699eef39e6ddc6868493ce3bdb8ed21c087a7f9d71c6eb6f48491ddd022bf498e527d98fd17f1a800377d02b105b78526efb2eddca462f1b19340b
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SSDEEP
768:q7PdFecFS5agQtOOtEvwDpjeMLZdzuqpXsiE8Wq/DpkITYabDb2:qDdFJy3QMOtEvwDpjjWMl7TdC
Malware Config
Signatures
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Detection of CryptoLocker Variants 5 IoCs
resource yara_rule behavioral2/memory/4476-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/files/0x000b00000002339a-13.dat CryptoLocker_rule2 behavioral2/memory/4372-18-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/memory/4476-17-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/memory/4372-27-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 5 IoCs
resource yara_rule behavioral2/memory/4476-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/files/0x000b00000002339a-13.dat CryptoLocker_set1 behavioral2/memory/4372-18-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/memory/4476-17-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/memory/4372-27-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 -
UPX dump on OEP (original entry point) 5 IoCs
resource yara_rule behavioral2/memory/4476-0-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/files/0x000b00000002339a-13.dat UPX behavioral2/memory/4372-18-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/memory/4476-17-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/memory/4372-27-0x0000000000500000-0x0000000000510000-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-1-5-21-1337824034-2731376981-3755436523-1000\Control Panel\International\Geo\Nation 2024-06-12_ef1b6f05471066e3ef54f455a29d79a1_cryptolocker.exe -
Executes dropped EXE 1 IoCs
pid Process 4372 asih.exe -
resource yara_rule behavioral2/memory/4476-0-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/files/0x000b00000002339a-13.dat upx behavioral2/memory/4372-18-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/memory/4476-17-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/memory/4372-27-0x0000000000500000-0x0000000000510000-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 4476 wrote to memory of 4372 4476 2024-06-12_ef1b6f05471066e3ef54f455a29d79a1_cryptolocker.exe 83 PID 4476 wrote to memory of 4372 4476 2024-06-12_ef1b6f05471066e3ef54f455a29d79a1_cryptolocker.exe 83 PID 4476 wrote to memory of 4372 4476 2024-06-12_ef1b6f05471066e3ef54f455a29d79a1_cryptolocker.exe 83
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-06-12_ef1b6f05471066e3ef54f455a29d79a1_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-06-12_ef1b6f05471066e3ef54f455a29d79a1_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4476 -
C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
PID:4372
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
40KB
MD583a13a523f26e7315536e08edd61f11a
SHA1a115c13075fb0f9b2b542b2f5d86520ec6d82cd7
SHA256b4cb1228fad5380f97c8e144e34e52f6be52f795ef63854f618076c82d7df09d
SHA512a3b5810a9ca0e71305a10180011cc72ffdae73b49b62d5a7316ad9c7db9f131fc769f7c12fd7f06f982f8b80d906f4c03f1a0610f6355d51a36d458b61bad71d