e6d1cc9b4d77102127eb3f6e2d1041bca1336bf0712faed2e9d8e12b6e90f696

Analysis

max time kernel
31s
max time network
34s
platform
windows7_x64
resource
win7-20221111-en
resource tags

arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
submitted
05-12-2022 02:38

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General

Target

e6d1cc9b4d77102127eb3f6e2d1041bca1336bf0712faed2e9d8e12b6e90f696.exe
Size

600KB
MD5

efefc226591ab95fe3e4727537ef5aec
SHA1

aae4b0c999668ccf159606f39198bd4f683bb20c
SHA256

e6d1cc9b4d77102127eb3f6e2d1041bca1336bf0712faed2e9d8e12b6e90f696
SHA512

409421763c42f0f6f33d98d0c5a7e8042ec8d05fcf870605846514207dca1a1e2406fce4ef503a0d1c543ed1979ec794c2912898a0db5d3400b766e7c7655b07
SSDEEP

12288:lFszBhqS5mEA7/GY4FLp5eknFF3JbooW1IVFAIgDZkWP+7:lFszWS5m7WFLp5zf3JbooW14AIgDA7

Score

8^/10

bootkit persistence

Malware Config

Signatures

Executes dropped EXE 1 IoCs

Processes:

crk.exe

pid process

268 crk.exe

pid	process
268	crk.exe

Loads dropped DLL 2 IoCs

Processes:

e6d1cc9b4d77102127eb3f6e2d1041bca1336bf0712faed2e9d8e12b6e90f696.exe

pid	process
1724	e6d1cc9b4d77102127eb3f6e2d1041bca1336bf0712faed2e9d8e12b6e90f696.exe
1724	e6d1cc9b4d77102127eb3f6e2d1041bca1336bf0712faed2e9d8e12b6e90f696.exe

Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs
Bootkits write to the MBR to gain persistence at a level below the operating system.
bootkit persistence

Bootkit
T1067

Processes:

crk.exe

description ioc process

File opened for modification \??\PhysicalDrive0 crk.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

description	ioc	process
File opened for modification	\??\PhysicalDrive0	crk.exe

Modifies registry class 3 IoCs

Processes:

crk.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.key\ = "regfile"	crk.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.key	crk.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.key\	crk.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

crk.exe

pid process

268 crk.exe

pid	process
268	crk.exe

Suspicious use of WriteProcessMemory 7 IoCs

Processes:

e6d1cc9b4d77102127eb3f6e2d1041bca1336bf0712faed2e9d8e12b6e90f696.exe

description	pid	process	target process
PID 1724 wrote to memory of 268	1724	e6d1cc9b4d77102127eb3f6e2d1041bca1336bf0712faed2e9d8e12b6e90f696.exe	crk.exe
PID 1724 wrote to memory of 268	1724	e6d1cc9b4d77102127eb3f6e2d1041bca1336bf0712faed2e9d8e12b6e90f696.exe	crk.exe
PID 1724 wrote to memory of 268	1724	e6d1cc9b4d77102127eb3f6e2d1041bca1336bf0712faed2e9d8e12b6e90f696.exe	crk.exe
PID 1724 wrote to memory of 268	1724	e6d1cc9b4d77102127eb3f6e2d1041bca1336bf0712faed2e9d8e12b6e90f696.exe	crk.exe
PID 1724 wrote to memory of 268	1724	e6d1cc9b4d77102127eb3f6e2d1041bca1336bf0712faed2e9d8e12b6e90f696.exe	crk.exe
PID 1724 wrote to memory of 268	1724	e6d1cc9b4d77102127eb3f6e2d1041bca1336bf0712faed2e9d8e12b6e90f696.exe	crk.exe
PID 1724 wrote to memory of 268	1724	e6d1cc9b4d77102127eb3f6e2d1041bca1336bf0712faed2e9d8e12b6e90f696.exe	crk.exe

C:\Users\Admin\AppData\Local\Temp\e6d1cc9b4d77102127eb3f6e2d1041bca1336bf0712faed2e9d8e12b6e90f696.exe
"C:\Users\Admin\AppData\Local\Temp\e6d1cc9b4d77102127eb3f6e2d1041bca1336bf0712faed2e9d8e12b6e90f696.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1724

C:\Users\Admin\AppData\Roaming\crk.exe
"C:\Users\Admin\AppData\Roaming\crk.exe"
2⤵
- Executes dropped EXE
- Writes to the Master Boot Record (MBR)
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:268

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Bootkit

T1067

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\crk.exe
Filesize
185KB

MD5
60b04ee202b9debd8d79b522b806ffb4

SHA1
ced400600556a6baede3c465127d17fe0b1760c9

SHA256
456269da0f9d4fb19b2060e9d369435544d820e156ba665f8e5d7736f1c28ac6

SHA512
9a693e25e4991c773bb4dcdbe773f7bb7cb0fecd93b54f41589186d8669611106b8c25d5546f38c1a0a47422df83f00cef958a6aa1e482f1fb505b4c4cdbadb6

Download Submit
\Users\Admin\AppData\Roaming\crk.exe
Filesize
185KB

MD5
60b04ee202b9debd8d79b522b806ffb4

SHA1
ced400600556a6baede3c465127d17fe0b1760c9

SHA256
456269da0f9d4fb19b2060e9d369435544d820e156ba665f8e5d7736f1c28ac6

SHA512
9a693e25e4991c773bb4dcdbe773f7bb7cb0fecd93b54f41589186d8669611106b8c25d5546f38c1a0a47422df83f00cef958a6aa1e482f1fb505b4c4cdbadb6

Download Submit
\Users\Admin\AppData\Roaming\crk.exe
Filesize
185KB

MD5
60b04ee202b9debd8d79b522b806ffb4

SHA1
ced400600556a6baede3c465127d17fe0b1760c9

SHA256
456269da0f9d4fb19b2060e9d369435544d820e156ba665f8e5d7736f1c28ac6

SHA512
9a693e25e4991c773bb4dcdbe773f7bb7cb0fecd93b54f41589186d8669611106b8c25d5546f38c1a0a47422df83f00cef958a6aa1e482f1fb505b4c4cdbadb6

Download Submit
memory/268-57-0x0000000000000000-mapping.dmp

Download
memory/268-62-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/268-63-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1724-54-0x0000000075E01000-0x0000000075E03000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads