babuk | 82e560a078cd7bb4472d5af832a04c4bc8f1001bac97b1574efe9863d3f66550

Analysis

max time kernel
148s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
25-03-2024 20:54

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General

Target

e_win.exe
Size

79KB
MD5

e5adc80639046a5c69bcfeee458e0833
SHA1

d9e3f9edda5df290b5be6fb1d335b750dd7c6758
SHA256

ea95f131bd9b49104d9e7ae83335254549ded9d71d557c6e4746740aecca2c85
SHA512

c11a24e14ba5fa2b0e2c2b544dd4218ce4c8caae3db7cebd5b0305223f96bde09c9bd237cb8d32768f30118f7be73240971e772f7a89db7c0fba5c6105107e3a
SSDEEP

1536:H6UhZM4hubesrQLOJgY8ZZP8LHD4XWaNH71dLdG1iiFM2iG2zs4:7hZ5YesrQLOJgY8Zp8LHD4XWaNH71dLI

Score

10^/10

babuk ransomware

Malware Config

Signatures

Babuk Locker
RaaS first seen in 2021 initially called Vasa Locker.
ransomware babuk
Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
ransomware

File Deletion
T1070.004

Inhibit System Recovery
T1490
Renames multiple (185) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
ransomware
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.

Query Registry
T1012

System Information Discovery
T1082

Processes:

e_win.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-983155329-280873152-1838004294-1000\Control Panel\International\Geo\Nation e_win.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-983155329-280873152-1838004294-1000\Control Panel\International\Geo\Nation	e_win.exe

Enumerates connected drives 3 TTPs 23 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Processes:

e_win.exe

description	ioc	process
File opened (read-only)	\??\O:	e_win.exe
File opened (read-only)	\??\A:	e_win.exe
File opened (read-only)	\??\S:	e_win.exe
File opened (read-only)	\??\V:	e_win.exe
File opened (read-only)	\??\B:	e_win.exe
File opened (read-only)	\??\W:	e_win.exe
File opened (read-only)	\??\R:	e_win.exe
File opened (read-only)	\??\T:	e_win.exe
File opened (read-only)	\??\U:	e_win.exe
File opened (read-only)	\??\K:	e_win.exe
File opened (read-only)	\??\L:	e_win.exe
File opened (read-only)	\??\Z:	e_win.exe
File opened (read-only)	\??\M:	e_win.exe
File opened (read-only)	\??\Y:	e_win.exe
File opened (read-only)	\??\I:	e_win.exe
File opened (read-only)	\??\P:	e_win.exe
File opened (read-only)	\??\G:	e_win.exe
File opened (read-only)	\??\H:	e_win.exe
File opened (read-only)	\??\J:	e_win.exe
File opened (read-only)	\??\X:	e_win.exe
File opened (read-only)	\??\N:	e_win.exe
File opened (read-only)	\??\Q:	e_win.exe
File opened (read-only)	\??\E:	e_win.exe

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

System Information Discovery
T1082
Interacts with shadow copies 2 TTPs 2 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
ransomware

File Deletion
T1070.004

Inhibit System Recovery
T1490

Processes:

vssadmin.exevssadmin.exe

pid process

2276 vssadmin.exe
5044 vssadmin.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

e_win.exe

pid process

1564 e_win.exe
1564 e_win.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

vssvc.exe

description pid process

Token: SeBackupPrivilege 4124 vssvc.exe
Token: SeRestorePrivilege 4124 vssvc.exe
Token: SeAuditPrivilege 4124 vssvc.exe

pid	process
2276	vssadmin.exe
5044	vssadmin.exe

pid	process
1564	e_win.exe
1564	e_win.exe

description	pid	process
Token: SeBackupPrivilege	4124	vssvc.exe
Token: SeRestorePrivilege	4124	vssvc.exe
Token: SeAuditPrivilege	4124	vssvc.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

e_win.execmd.execmd.exe

description	pid	process	target process
PID 1564 wrote to memory of 4592	1564	e_win.exe	cmd.exe
PID 1564 wrote to memory of 4592	1564	e_win.exe	cmd.exe
PID 4592 wrote to memory of 2276	4592	cmd.exe	vssadmin.exe
PID 4592 wrote to memory of 2276	4592	cmd.exe	vssadmin.exe
PID 1564 wrote to memory of 2348	1564	e_win.exe	cmd.exe
PID 1564 wrote to memory of 2348	1564	e_win.exe	cmd.exe
PID 2348 wrote to memory of 5044	2348	cmd.exe	vssadmin.exe
PID 2348 wrote to memory of 5044	2348	cmd.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\e_win.exe
"C:\Users\Admin\AppData\Local\Temp\e_win.exe"
1⤵
- Checks computer location settings
- Enumerates connected drives
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1564
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c vssadmin.exe delete shadows /all /quiet
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4592
- - C:\Windows\system32\vssadmin.exe
    vssadmin.exe delete shadows /all /quiet
    3⤵
    - Interacts with shadow copies
    PID:2276
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c vssadmin.exe delete shadows /all /quiet
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2348
- - C:\Windows\system32\vssadmin.exe
    vssadmin.exe delete shadows /all /quiet
    3⤵
    - Interacts with shadow copies
    PID:5044

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4124

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Indicator Removal

T1070

File Deletion

T1070.004

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Inhibit System Recovery

T1490

Replay Monitor

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Downloads

C:\Recovery\How To Restore Your Files.txt

Filesize
8KB

MD5
2af817219bb1d24a11ab839b9453b5f3

SHA1
f9ff9075f9472c41aeb93df2e439fe624dc143b0

SHA256
6a16454cad4534d51025f65277abaec0ff4a30082840154a35889445bb3ad0a0

SHA512
d443e149d8b097cc64b0bbbf65e3d660de43943a4b36ac4c41bfbdfe814fb895d7ba97128aa1235b85d2292b79afc451fbcb89cc6a56d33ecff7d93e18a15c30

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