73509194fbb3ff4cd6113e17668c6f9ad5a8ec1a12d3fc24e024924e5d87aa58

Analysis

max time kernel
40s
max time network
42s
platform
windows7_x64
resource
win7v20201028
submitted
05-12-2020 03:36

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Reason

Machine shutdown

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General

Target

sample.exe
Size

5.1MB
MD5

3a92b81cf885e960e1449ef9afaa0534
SHA1

4a44220eef6874036c0413be132bb5a21d71d2ff
SHA256

16015c33b2b39392a2776d1c0e5917d0051483ab0e473679447798e0fc5e65b0
SHA512

97d32f84b56e872109ca21b7a1b183c33a3f721878962819247b74bbef400bde9638dfc006905f2cfc2c8903d0974f9783c7cc8693e189a46af00bcecf8bb7e1

Score

8^/10

ransomware spyware

Malware Config

Signatures

Modifies extensions of user files 9 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

Processes:

sample.exe

description	ioc	process
File created	C:\Users\Admin\Pictures\ConvertResize.tif.locked	sample.exe
File created	C:\Users\Admin\Pictures\ResolveInstall.tiff.locked	sample.exe
File created	C:\Users\Admin\Pictures\StopCheckpoint.tiff	sample.exe
File created	C:\Users\Admin\Pictures\AddGrant.raw.locked	sample.exe
File created	C:\Users\Admin\Pictures\MountClose.tiff	sample.exe
File created	C:\Users\Admin\Pictures\ResolveInstall.tiff	sample.exe
File created	C:\Users\Admin\Pictures\StopCheckpoint.tiff.locked	sample.exe
File created	C:\Users\Admin\Pictures\UnregisterTest.png.locked	sample.exe
File created	C:\Users\Admin\Pictures\MountClose.tiff.locked	sample.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware

Data from Local System
T1005

Credentials in Files
T1081
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

shutdown.exe

description pid process

Token: SeShutdownPrivilege 1456 shutdown.exe
Token: SeRemoteShutdownPrivilege 1456 shutdown.exe

description	pid	process
Token: SeShutdownPrivilege	1456	shutdown.exe
Token: SeRemoteShutdownPrivilege	1456	shutdown.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

sample.execmd.exe

description	pid	process	target process
PID 648 wrote to memory of 324	648	sample.exe	cmd.exe
PID 648 wrote to memory of 324	648	sample.exe	cmd.exe
PID 648 wrote to memory of 324	648	sample.exe	cmd.exe
PID 648 wrote to memory of 324	648	sample.exe	cmd.exe
PID 324 wrote to memory of 1456	324	cmd.exe	shutdown.exe
PID 324 wrote to memory of 1456	324	cmd.exe	shutdown.exe
PID 324 wrote to memory of 1456	324	cmd.exe	shutdown.exe
PID 324 wrote to memory of 1456	324	cmd.exe	shutdown.exe

C:\Users\Admin\AppData\Local\Temp\sample.exe
"C:\Users\Admin\AppData\Local\Temp\sample.exe"
1⤵
- Modifies extensions of user files
- Suspicious use of WriteProcessMemory
PID:648

C:\Windows\SysWOW64\cmd.exe
cmd.exe /c "shutdown /r /f /t 1"
2⤵
- Suspicious use of WriteProcessMemory
PID:324

C:\Windows\SysWOW64\shutdown.exe
shutdown /r /f /t 1
3⤵
- Suspicious use of AdjustPrivilegeToken
PID:1456

C:\Windows\system32\wlrmdr.exe
-s -1 -f 2 -t You are about to be logged off -m Windows will shut down in less than a minute. -a 3
1⤵
PID:940

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x0
1⤵
PID:1380

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x1
1⤵
PID:1564

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

Lateral Movement

Collection

Data from Local System

T1005

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

memory/324-3-0x0000000000000000-mapping.dmp

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memory/648-2-0x0000000000400000-0x0000000000938000-memory.dmp

Filesize
5.2MB

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memory/1456-4-0x0000000000000000-mapping.dmp

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