27e2d06bd818ef96f2310db2ee8d5ec73ae27c46fc13f0fa223f0fb18cbece71

General

Target

2024-03-25_1035df6c5d3c42999fd62d2e86609063_cryptolocker.exe
Size

98KB
MD5

1035df6c5d3c42999fd62d2e86609063
SHA1

af937edbe5fd0f676b0a7390a2ec14c575341ffb
SHA256

27e2d06bd818ef96f2310db2ee8d5ec73ae27c46fc13f0fa223f0fb18cbece71
SHA512

868642fd553850ba3d7d8e1953d4a74fad8a9b97c5c012fa46e7533d3eb82b3ecdcfcd6a087fe06c5daf0e8f527989a63530590d12df9e7c2f239a01d54344cb
SSDEEP

1536:z6QFElP6n+gKmddpMOtEvwDpj3GYQbbr/BKiseW:z6a+CdOOtEvwDpjcgH

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 6 IoCs

resource	yara_rule
behavioral1/memory/2848-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral1/files/0x000b000000012251-11.dat	CryptoLocker_rule2
behavioral1/memory/2848-15-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral1/files/0x000b000000012251-14.dat	CryptoLocker_rule2
behavioral1/memory/2540-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral1/memory/2540-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 6 IoCs

resource	yara_rule
behavioral1/memory/2848-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral1/files/0x000b000000012251-11.dat	CryptoLocker_set1
behavioral1/memory/2848-15-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral1/files/0x000b000000012251-14.dat	CryptoLocker_set1
behavioral1/memory/2540-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral1/memory/2540-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 6 IoCs

resource	yara_rule
behavioral1/memory/2848-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral1/files/0x000b000000012251-11.dat	UPX
behavioral1/memory/2848-15-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral1/files/0x000b000000012251-14.dat	UPX
behavioral1/memory/2540-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral1/memory/2540-26-0x0000000000500000-0x0000000000510000-memory.dmp	UPX

Executes dropped EXE 1 IoCs

pid	Process
2540	asih.exe

Loads dropped DLL 1 IoCs

pid	Process
2848	2024-03-25_1035df6c5d3c42999fd62d2e86609063_cryptolocker.exe

UPX packed file 6 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral1/memory/2848-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral1/files/0x000b000000012251-11.dat	upx
behavioral1/memory/2848-15-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral1/files/0x000b000000012251-14.dat	upx
behavioral1/memory/2540-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral1/memory/2540-26-0x0000000000500000-0x0000000000510000-memory.dmp	upx

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2848 wrote to memory of 2540	2848	2024-03-25_1035df6c5d3c42999fd62d2e86609063_cryptolocker.exe	28
PID 2848 wrote to memory of 2540	2848	2024-03-25_1035df6c5d3c42999fd62d2e86609063_cryptolocker.exe	28
PID 2848 wrote to memory of 2540	2848	2024-03-25_1035df6c5d3c42999fd62d2e86609063_cryptolocker.exe	28
PID 2848 wrote to memory of 2540	2848	2024-03-25_1035df6c5d3c42999fd62d2e86609063_cryptolocker.exe	28

C:\Users\Admin\AppData\Local\Temp\2024-03-25_1035df6c5d3c42999fd62d2e86609063_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-03-25_1035df6c5d3c42999fd62d2e86609063_cryptolocker.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2848
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:2540

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\asih.exe

Filesize
64KB

MD5
bbee9f54a911b9f52f6b0efe50aa5e6e

SHA1
4899c3fafc5dc2c084f4d45f75e57f9a585086bf

SHA256
6f9617f96ac454a92fad304d802a68935d9a2488f822e80380553a0523cab6b3

SHA512
bae856800c110c1f367521607877aaf4e9a2df1a7efa283c02aa09b0f98372da7bf41d9d891a2d24ed7ed258084e1d9714975967f6d8c4300950679e994734dc

Download Submit
\Users\Admin\AppData\Local\Temp\asih.exe

Filesize
98KB

MD5
c95aca1a47d4f3102ceea36d2bc899c4

SHA1
dbf42e9e7bf8639b03358fd2e408e66ad311d37d

SHA256
06ee473696b6978aefa67ae79e2ed4b41bc6dddb93309fd7d387bf5ed05f4578

SHA512
01755fd88072f13f9585075ef3033041b14dfc36416b248854c90c97c3f64afa83fd8d39108dbfd6bc275a27012829c27e68f02285e8e903ab424cdf1738f418

Download Submit
memory/2540-18-0x0000000000350000-0x0000000000356000-memory.dmp

Filesize
24KB

Download
memory/2540-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/2540-20-0x00000000002C0000-0x00000000002C6000-memory.dmp

Filesize
24KB

Download
memory/2540-26-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/2848-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/2848-1-0x0000000000250000-0x0000000000256000-memory.dmp

Filesize
24KB

Download
memory/2848-2-0x0000000000290000-0x0000000000296000-memory.dmp

Filesize
24KB

Download
memory/2848-9-0x0000000000250000-0x0000000000256000-memory.dmp

Filesize
24KB

Download
memory/2848-15-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download

Analysis

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