022728f678d8dcc6cba20147595ed4099e9c98be0582c0f67518d5664e3b8523

Analysis

max time kernel
143s
max time network
164s
platform
windows10-2004_x64
resource
win10v2004-20240226-uk
resource tags

arch:x64arch:x86image:win10v2004-20240226-uklocale:uk-uaos:windows10-2004-x64systemwindows
submitted
03-03-2024 13:53

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General

Target

Ransomware/Rokku.exe
Size

666KB
MD5

97512f4617019c907cd0f88193039e7c
SHA1

24cfa261ee30f697e7d1e2215eee1c21eebf4579
SHA256

438888ef36bad1079af79daf152db443b4472c5715a7b3da0ba24cc757c53499
SHA512

cfbb8dd91434f917d507cb919aa7e6b16b7b2056d56185f6ad5b6149e05629325cdb3df907f58bb3f634b17a9989bf5b6d6b81f5396a3a556431742ed742ac4a
SSDEEP

12288:bB/72HFAQBMiZB7fJJ2qDHKK/K5FJL+xQhrwjeI:bBKqFiT7fJJ2qbKK6F5+xQhrEJ

Score

10^/10

ransomware upx

Malware Config

Extracted

Path

C:\Recovery\WindowsRE\README_HOW_TO_UNLOCK.TXT

Ransom Note

YOUR FILE HAS BEEN LOCKED In order to unlock your files, follow the instructions bellow: 1. Download and install Tor Browser 2. After a successful installation, run Tor Browser and wait for its initialization. 3. Type in the address bar: http://zvnvp2rhe3ljwf2m.onion 4. Follow the instructions on the site.

URLs

http://zvnvp2rhe3ljwf2m.onion

Signatures

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 (63) 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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2727153400-192325109-1870347593-1000\Control Panel\International\Geo\Nation	Rokku.exe

UPX packed file 2 IoCs

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

upx

resource	yara_rule
behavioral28/memory/848-0-0x0000000000400000-0x000000000058D000-memory.dmp	upx
behavioral28/memory/848-218-0x0000000000400000-0x000000000058D000-memory.dmp	upx

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

System Information Discovery
T1082
Runs net.exe

Suspicious use of AdjustPrivilegeToken 45 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	2160	WMIC.exe
Token: SeSecurityPrivilege	2160	WMIC.exe
Token: SeTakeOwnershipPrivilege	2160	WMIC.exe
Token: SeLoadDriverPrivilege	2160	WMIC.exe
Token: SeSystemProfilePrivilege	2160	WMIC.exe
Token: SeSystemtimePrivilege	2160	WMIC.exe
Token: SeProfSingleProcessPrivilege	2160	WMIC.exe
Token: SeIncBasePriorityPrivilege	2160	WMIC.exe
Token: SeCreatePagefilePrivilege	2160	WMIC.exe
Token: SeBackupPrivilege	2160	WMIC.exe
Token: SeRestorePrivilege	2160	WMIC.exe
Token: SeShutdownPrivilege	2160	WMIC.exe
Token: SeDebugPrivilege	2160	WMIC.exe
Token: SeSystemEnvironmentPrivilege	2160	WMIC.exe
Token: SeRemoteShutdownPrivilege	2160	WMIC.exe
Token: SeUndockPrivilege	2160	WMIC.exe
Token: SeManageVolumePrivilege	2160	WMIC.exe
Token: 33	2160	WMIC.exe
Token: 34	2160	WMIC.exe
Token: 35	2160	WMIC.exe
Token: 36	2160	WMIC.exe
Token: SeIncreaseQuotaPrivilege	2160	WMIC.exe
Token: SeSecurityPrivilege	2160	WMIC.exe
Token: SeTakeOwnershipPrivilege	2160	WMIC.exe
Token: SeLoadDriverPrivilege	2160	WMIC.exe
Token: SeSystemProfilePrivilege	2160	WMIC.exe
Token: SeSystemtimePrivilege	2160	WMIC.exe
Token: SeProfSingleProcessPrivilege	2160	WMIC.exe
Token: SeIncBasePriorityPrivilege	2160	WMIC.exe
Token: SeCreatePagefilePrivilege	2160	WMIC.exe
Token: SeBackupPrivilege	2160	WMIC.exe
Token: SeRestorePrivilege	2160	WMIC.exe
Token: SeShutdownPrivilege	2160	WMIC.exe
Token: SeDebugPrivilege	2160	WMIC.exe
Token: SeSystemEnvironmentPrivilege	2160	WMIC.exe
Token: SeRemoteShutdownPrivilege	2160	WMIC.exe
Token: SeUndockPrivilege	2160	WMIC.exe
Token: SeManageVolumePrivilege	2160	WMIC.exe
Token: 33	2160	WMIC.exe
Token: 34	2160	WMIC.exe
Token: 35	2160	WMIC.exe
Token: 36	2160	WMIC.exe
Token: SeBackupPrivilege	1704	vssvc.exe
Token: SeRestorePrivilege	1704	vssvc.exe
Token: SeAuditPrivilege	1704	vssvc.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 848 wrote to memory of 2160	848	Rokku.exe	88
PID 848 wrote to memory of 2160	848	Rokku.exe	88
PID 848 wrote to memory of 2160	848	Rokku.exe	88
PID 848 wrote to memory of 4476	848	Rokku.exe	90
PID 848 wrote to memory of 4476	848	Rokku.exe	90
PID 848 wrote to memory of 4476	848	Rokku.exe	90
PID 848 wrote to memory of 2044	848	Rokku.exe	92
PID 848 wrote to memory of 2044	848	Rokku.exe	92
PID 848 wrote to memory of 2044	848	Rokku.exe	92
PID 848 wrote to memory of 4452	848	Rokku.exe	94
PID 848 wrote to memory of 4452	848	Rokku.exe	94
PID 848 wrote to memory of 4452	848	Rokku.exe	94
PID 848 wrote to memory of 4520	848	Rokku.exe	96
PID 848 wrote to memory of 4520	848	Rokku.exe	96
PID 848 wrote to memory of 4520	848	Rokku.exe	96
PID 848 wrote to memory of 1372	848	Rokku.exe	98
PID 848 wrote to memory of 1372	848	Rokku.exe	98
PID 848 wrote to memory of 1372	848	Rokku.exe	98
PID 1372 wrote to memory of 3380	1372	net.exe	101
PID 1372 wrote to memory of 3380	1372	net.exe	101
PID 1372 wrote to memory of 3380	1372	net.exe	101
PID 4452 wrote to memory of 224	4452	net.exe	100
PID 4452 wrote to memory of 224	4452	net.exe	100
PID 4452 wrote to memory of 224	4452	net.exe	100
PID 4520 wrote to memory of 4172	4520	net.exe	102
PID 4520 wrote to memory of 4172	4520	net.exe	102
PID 4520 wrote to memory of 4172	4520	net.exe	102

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\Ransomware\Rokku.exe
"C:\Users\Admin\AppData\Local\Temp\Ransomware\Rokku.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:848
- C:\Windows\SysWOW64\wbem\WMIC.exe
  "C:\Windows\System32\wbem\WMIC.exe" shadowcopy delete /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2160
- C:\Windows\SysWOW64\reg.exe
  "C:\Windows\System32\reg.exe" add "HKLM\SYSTEM\CurrentControlSet\services\VSS" /v Start /t REG_DWORD /d 4 /f
  2⤵
  PID:4476
- C:\Windows\SysWOW64\reg.exe
  "C:\Windows\System32\reg.exe" add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore" /v DisableSR /t REG_DWORD /d 1 /f
  2⤵
  PID:2044
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop vss
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4452
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop vss
    3⤵
    PID:224
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop swprv
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4520
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop swprv
    3⤵
    PID:4172
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop srservice
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1372
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop srservice
    3⤵
    PID:3380

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1704

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

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\WindowsRE\README_HOW_TO_UNLOCK.HTML

Filesize
1KB

MD5
c784d96ca311302c6f2f8f0bee8c725b

SHA1
dc68b518ce0eef4f519f9127769e3e3fa8edce46

SHA256
a7836550412b0e0963d16d8442b894a1148326b86d119e4d30f1b11956380ef0

SHA512
f97891dc3c3f15b9bc3446bc9d5913431f374aa54cced33d2082cf14d173a8178e29a8d9487c2a1ab87d2f6abf37e915f69f45c0d8b747ad3f17970645c35d98

Download Submit
C:\Recovery\WindowsRE\README_HOW_TO_UNLOCK.TXT

Filesize
330B

MD5
04b892b779d04f3a906fde1a904d98bb

SHA1
1a0d6cb6f921bc06ba9547a84b872ef61eb7e8a5

SHA256
eb22c6ecfd4d7d0fcea5063201ccf5e7313780e007ef47cca01f1369ee0e6be0

SHA512
e946aa4ac3ec9e5a178eac6f4c63a98f46bc85bed3efd6a53282d87aa56e53b4c11bb0d1c58c6c670f9f4ad9952b5e7fd1bb310a8bd7b5b04e7c607d1b74238a

Download Submit
memory/848-0-0x0000000000400000-0x000000000058D000-memory.dmp

Filesize
1.6MB

Download
memory/848-1-0x0000000000860000-0x00000000008A3000-memory.dmp

Filesize
268KB

Download
memory/848-218-0x0000000000400000-0x000000000058D000-memory.dmp

Filesize
1.6MB

Download
memory/848-224-0x0000000000860000-0x00000000008A3000-memory.dmp

Filesize
268KB

Download