471f3fb1a953fab38be3081eb835574694bc72b94f239edc400d1ce3d7a8ecb0

Analysis

max time kernel
840s
max time network
841s
platform
windows7_x64
resource
win7-20241023-en
resource tags

arch:x64arch:x86image:win7-20241023-enlocale:en-usos:windows7-x64system
submitted
22-11-2024 02:43

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General

Target

900.exe
Size

12KB
MD5

5a43d2db5c8cc3b8ec273aa470ccc931
SHA1

dfcc68945b9daf7e9f49be4837a6934560ec635f
SHA256

2424a7ce5e885bf460aeb8968ceab48057813430973c5a2e27d846553e79402c
SHA512

ffae7fe714667cb44d200f87c36a6f60735926d03ce86dd5756b7e91ab1bd04e7b98dccd1dc0b3f652ea50f5d4c74ffa1f66245052b61e00fd0e8273681a99d3
SSDEEP

192:LvJ8ZxTFrv7bg1d4/QkODGAoyjwlkp7qQT6yNQ+pJYMq6fdw4RI2P:d8zt+UFxy9p7qk3DfC4RI

Score

9^/10

credential_access defense_evasion discovery execution impact ransomware spyware stealer

Malware Config

Signatures

Deletes shadow copies 3 TTPs
Ransomware often targets backup files to inhibit system recovery.
ransomware defense_evasion impact execution

File Deletion
T1070.004

Inhibit System Recovery
T1490

Windows Management Instrumentation
T1047
Renames multiple (1077) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
ransomware
Credentials from Password Stores: Windows Credential Manager 1 TTPs
Suspicious access to Credentials History.
credential_access stealer

Windows Credential Manager
T1555.004
Drops startup file 1 IoCs

Processes:

900.exe

description ioc process

File created C:\Users\Admin\AppData\Roaming\Microsoft\Word\STARTUP\HOW_TO_RESTORE_FILES.txt 900.exe
Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Word\STARTUP\HOW_TO_RESTORE_FILES.txt	900.exe

Drops desktop.ini file(s) 35 IoCs

Processes:

900.exe

description	ioc	process
File opened for modification	C:\Users\Public\desktop.ini	900.exe
File opened for modification	C:\Users\Admin\Favorites\Links\desktop.ini	900.exe
File opened for modification	C:\Users\Admin\Links\desktop.ini	900.exe
File opened for modification	C:\Users\Admin\Saved Games\desktop.ini	900.exe
File opened for modification	C:\Users\Public\Documents\desktop.ini	900.exe
File opened for modification	C:\Users\Public\Music\desktop.ini	900.exe
File opened for modification	C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\desktop.ini	900.exe
File opened for modification	C:\Users\Admin\Favorites\Links for United States\desktop.ini	900.exe
File opened for modification	C:\Users\Default\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini	900.exe
File opened for modification	C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\SMFN3Z3Q\desktop.ini	900.exe
File opened for modification	C:\Users\Public\Videos\Sample Videos\desktop.ini	900.exe
File opened for modification	C:\Users\Public\Videos\desktop.ini	900.exe
File opened for modification	C:\Users\Admin\Contacts\desktop.ini	900.exe
File opened for modification	C:\Users\Public\Downloads\desktop.ini	900.exe
File opened for modification	C:\Users\Public\Recorded TV\Sample Media\desktop.ini	900.exe
File opened for modification	C:\Users\Admin\Videos\desktop.ini	900.exe
File opened for modification	C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\JEDNWX6E\desktop.ini	900.exe
File opened for modification	C:\Users\Admin\Favorites\desktop.ini	900.exe
File opened for modification	C:\Users\Admin\Searches\desktop.ini	900.exe
File opened for modification	C:\Users\Admin\Pictures\desktop.ini	900.exe
File opened for modification	C:\Users\Public\Music\Sample Music\desktop.ini	900.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini	900.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini	900.exe
File opened for modification	C:\Users\Admin\Music\desktop.ini	900.exe
File opened for modification	C:\Users\Public\Libraries\desktop.ini	900.exe
File opened for modification	C:\Users\Public\Pictures\Sample Pictures\desktop.ini	900.exe
File opened for modification	C:\Users\Public\Recorded TV\desktop.ini	900.exe
File opened for modification	C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\4FXYHFK9\desktop.ini	900.exe
File opened for modification	C:\Users\Admin\Desktop\desktop.ini	900.exe
File opened for modification	C:\Users\Public\Desktop\desktop.ini	900.exe
File opened for modification	C:\Users\Admin\Downloads\desktop.ini	900.exe
File opened for modification	C:\Users\Public\Pictures\desktop.ini	900.exe
File opened for modification	C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\DQFI3FMT\desktop.ini	900.exe
File opened for modification	C:\Users\Admin\AppData\Local\Microsoft\Windows Mail\Stationery\Desktop.ini	900.exe
File opened for modification	C:\Users\Admin\Documents\desktop.ini	900.exe

Browser Information Discovery 1 TTPs
Enumerate browser information.
discovery

Browser Information Discovery
T1217
System Location Discovery: System Language Discovery 1 TTPs 1 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
discovery

System Language Discovery
T1614.001

Processes:

900.exe

description ioc process

Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language 900.exe
Interacts with shadow copies 3 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
ransomware

File Deletion
T1070.004

Inhibit System Recovery
T1490

Direct Volume Access
T1006

Processes:

vssadmin.exe

pid process

1900 vssadmin.exe
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

900.exe

pid process

1388 900.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

vssvc.exe

description pid process

Token: SeBackupPrivilege 676 vssvc.exe
Token: SeRestorePrivilege 676 vssvc.exe
Token: SeAuditPrivilege 676 vssvc.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	900.exe

pid	process
1900	vssadmin.exe

pid	process
1388	900.exe

description	pid	process
Token: SeBackupPrivilege	676	vssvc.exe
Token: SeRestorePrivilege	676	vssvc.exe
Token: SeAuditPrivilege	676	vssvc.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

900.exe

description	pid	process	target process
PID 1388 wrote to memory of 1900	1388	900.exe	vssadmin.exe
PID 1388 wrote to memory of 1900	1388	900.exe	vssadmin.exe
PID 1388 wrote to memory of 1900	1388	900.exe	vssadmin.exe
PID 1388 wrote to memory of 1900	1388	900.exe	vssadmin.exe

Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware

C:\Users\Admin\AppData\Local\Temp\900.exe
"C:\Users\Admin\AppData\Local\Temp\900.exe"
1⤵
- Drops startup file
- Drops desktop.ini file(s)
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1388
- C:\Windows\system32\vssadmin.exe
  delete shadows /all /quiet
  2⤵
  - Interacts with shadow copies
  PID:1900

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:676

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Windows Management Instrumentation

T1047

Persistence

Privilege Escalation

Defense Evasion

Direct Volume Access

T1006

Indicator Removal

T1070

File Deletion

T1070.004

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Windows Credential Manager

T1555.004

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Browser Information Discovery

T1217

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Inhibit System Recovery

T1490

Replay Monitor

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Downloads

C:\MSOCache\All Users\{90140000-0019-0409-0000-0000000FF1CE}-C\HOW_TO_RESTORE_FILES.txt

Filesize
2KB

MD5
5fafc3b6b68f49c29eac195e146bfcf9

SHA1
e0bca64754c0209847eac372d7ce04b88891b773

SHA256
2938570788156bb73a583b6bf420d93c1236bccaa36baa074b53d7ec30a8dcb0

SHA512
59812e3a820cf6a9ee23478203cd5f9eb814baff3d210dc4ac29568544756e80aad62f42607e81f3a94720646a427c2bbcf3ba66b8277d4be33fddef469ecbf2

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