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Analysis
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max time kernel
150s -
max time network
156s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
27/03/2024, 04:20
Behavioral task
behavioral1
Sample
2024-03-27_f23741f0ee2f9ea1991d62b51730e2b2_cryptolocker.exe
Resource
win7-20240319-en
Behavioral task
behavioral2
Sample
2024-03-27_f23741f0ee2f9ea1991d62b51730e2b2_cryptolocker.exe
Resource
win10v2004-20240226-en
General
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Target
2024-03-27_f23741f0ee2f9ea1991d62b51730e2b2_cryptolocker.exe
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Size
149KB
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MD5
f23741f0ee2f9ea1991d62b51730e2b2
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SHA1
d2c6e1b6ff239a4053472f169b1c99e532c943ec
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SHA256
939173135ec998c4a7d9381707ecdb3d956eedaa95f687b342e3d4191042978f
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SHA512
3e4398783ec48eb9bb12352cd26d8b916d77900e6e246be1cb34f881438155eae1825e38c049061f38afb51ff8afda215019dc4c8220ae57a341660dbc746ab9
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SSDEEP
1536:z6QFElP6n+gKmddpMOtEvwDpj3GYQbN/PKwNgp699GNtL1e2i:z6a+CdOOtEvwDpjczh
Malware Config
Signatures
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Detection of CryptoLocker Variants 4 IoCs
resource yara_rule behavioral2/memory/4700-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/files/0x000b00000002320d-13.dat CryptoLocker_rule2 behavioral2/memory/4700-17-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/memory/4996-26-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 4 IoCs
resource yara_rule behavioral2/memory/4700-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/files/0x000b00000002320d-13.dat CryptoLocker_set1 behavioral2/memory/4700-17-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/memory/4996-26-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 -
UPX dump on OEP (original entry point) 4 IoCs
resource yara_rule behavioral2/memory/4700-0-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/files/0x000b00000002320d-13.dat UPX behavioral2/memory/4700-17-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/memory/4996-26-0x0000000000500000-0x0000000000510000-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-1-5-21-557049126-2506969350-2798870634-1000\Control Panel\International\Geo\Nation 2024-03-27_f23741f0ee2f9ea1991d62b51730e2b2_cryptolocker.exe -
Executes dropped EXE 1 IoCs
pid Process 4996 asih.exe -
resource yara_rule behavioral2/memory/4700-0-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/files/0x000b00000002320d-13.dat upx behavioral2/memory/4700-17-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/memory/4996-26-0x0000000000500000-0x0000000000510000-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 4700 wrote to memory of 4996 4700 2024-03-27_f23741f0ee2f9ea1991d62b51730e2b2_cryptolocker.exe 88 PID 4700 wrote to memory of 4996 4700 2024-03-27_f23741f0ee2f9ea1991d62b51730e2b2_cryptolocker.exe 88 PID 4700 wrote to memory of 4996 4700 2024-03-27_f23741f0ee2f9ea1991d62b51730e2b2_cryptolocker.exe 88
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-03-27_f23741f0ee2f9ea1991d62b51730e2b2_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-03-27_f23741f0ee2f9ea1991d62b51730e2b2_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4700 -
C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
PID:4996
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
149KB
MD52b5a04434c8556d6330cc66ea0092897
SHA1873b31def73c238e0aa48b1405f07b5c589f93b6
SHA256e4883421b6528d3f3ffb9e1883bb372c409f938cea1291dc583b8f508bdd4156
SHA5121d13aa5725ce7f6d4d139a891620186372a406bd770a138b31f8fd2e0f9f2180e3c73ec206aff2dae5b32dc619e626e4f908f3e2bff0d0886c060654cccb3b09