djvu | d69f5817cc5eadb99b3a8b0f87ca4a471c052f151f14180955f14ad78a1acacc

Analysis

max time kernel
592s
max time network
587s
platform
windows10-1703_x64
resource
win10-20240221-en
resource tags

arch:x64arch:x86image:win10-20240221-enlocale:en-usos:windows10-1703-x64system
submitted
27/03/2024, 20:28

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General

Target

buildz.exe
Size

728KB
MD5

1ac225bc36c31f9209f984210bd68469
SHA1

b43db3c1f19bca6b35e91ee88edf8c80d4e6c422
SHA256

d69f5817cc5eadb99b3a8b0f87ca4a471c052f151f14180955f14ad78a1acacc
SHA512

e99727b0b993b6911b402eb48c85eb81dd10b76894eabaad196618558f643ab6dd2e5c1a5d393e1537b089fdfdbe1d778c88f62fb0abd9384b461521422e53a3
SSDEEP

12288:yCLwobUsKbD6axHJhie99gldRoo+uoagdWip+KSN7uO7/:yYsmaZJwAglLoo+5WioKSN7ue/

Score

10^/10

djvu vidar 5739ef2bbcd39fcd59c5746bfe4238c5 discovery persistence ransomware stealer

Malware Config

Extracted

Family

djvu

http://sajdfue.com/test1/get.php

Attributes

extension
.vook
offline_id
1eSPzWRaNslCgtjBZfL5pzvovoiaVI4IZSnvAwt1
payload_url
http://sdfjhuz.com/dl/build2.exe

http://sajdfue.com/files/1/build3.exe
ransomnote
ATTENTION! Don't worry, you can return all your files! All your files like pictures, databases, documents and other important are encrypted with strongest encryption and unique key. The only method of recovering files is to purchase decrypt tool and unique key for you. This software will decrypt all your encrypted files. What guarantees you have? You can send one of your encrypted file from your PC and we decrypt it for free. But we can decrypt only 1 file for free. File must not contain valuable information. Do not ask assistants from youtube and recovery data sites for help in recovering your data. They can use your free decryption quota and scam you. Our contact is emails in this text document only. You can get and look video overview decrypt tool: https://wetransfer.com/downloads/3ed7a617738550b0a00c5aa231c0752020240316170955/d71ce1 Price of private key and decrypt software is $999. Discount 50% available if you contact us first 72 hours, that's price for you is $499. Please note that you'll never restore your data without payment. Check your e-mail "Spam" or "Junk" folder if you don't get answer more than 6 hours. To get this software you need write on our e-mail: [email protected] Reserve e-mail address to contact us: [email protected] Your personal ID: 0857PsawqS

rsa_pubkey.plain

Extracted

Family

vidar

Version

8.6

Botnet

5739ef2bbcd39fcd59c5746bfe4238c5

https://steamcommunity.com/profiles/76561199658817715

https://t.me/sa9ok

Attributes

profile_id_v2
5739ef2bbcd39fcd59c5746bfe4238c5
user_agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Signatures

Detect Vidar Stealer 5 IoCs

stealer

resource	yara_rule
behavioral2/memory/1620-46-0x0000000000400000-0x0000000000644000-memory.dmp	family_vidar_v7
behavioral2/memory/3256-51-0x00000000021B0000-0x00000000021E1000-memory.dmp	family_vidar_v7
behavioral2/memory/1620-52-0x0000000000400000-0x0000000000644000-memory.dmp	family_vidar_v7
behavioral2/memory/1620-50-0x0000000000400000-0x0000000000644000-memory.dmp	family_vidar_v7
behavioral2/memory/1620-58-0x0000000000400000-0x0000000000644000-memory.dmp	family_vidar_v7

Detected Djvu ransomware 17 IoCs

resource	yara_rule
behavioral2/memory/2312-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2312-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2312-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3380-4-0x00000000023E0000-0x00000000024FB000-memory.dmp	family_djvu
behavioral2/memory/2312-1-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2312-17-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4824-24-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4824-23-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4824-21-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4824-29-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4824-30-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4824-36-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4824-37-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4824-34-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4824-56-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/224-59-0x0000000002260000-0x00000000022FA000-memory.dmp	family_djvu
behavioral2/memory/4824-90-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu

Djvu Ransomware
Ransomware which is a variant of the STOP family.
ransomware djvu
Vidar
Vidar is an infostealer based on Arkei stealer.
stealer vidar
Downloads MZ/PE file

Executes dropped EXE 2 IoCs

pid	Process
3256	build2.exe
1620	build2.exe

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
4876	icacls.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3281913400-1494313570-2321515684-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\6cd87798-a58c-41a1-9ecf-b08746f7b2ec\\buildz.exe\" --AutoStart"	buildz.exe

Looks up external IP address via web service 3 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
2	api.2ip.ua
10	api.2ip.ua
1	api.2ip.ua

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 3380 set thread context of 2312	3380	buildz.exe	74
PID 224 set thread context of 4824	224	buildz.exe	78
PID 3256 set thread context of 1620	3256	build2.exe	80

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2404	1620	WerFault.exe	80

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2312	buildz.exe
2312	buildz.exe
4824	buildz.exe
4824	buildz.exe

Suspicious use of WriteProcessMemory 39 IoCs

description	pid	Process	procid_target
PID 3380 wrote to memory of 2312	3380	buildz.exe	74
PID 3380 wrote to memory of 2312	3380	buildz.exe	74
PID 3380 wrote to memory of 2312	3380	buildz.exe	74
PID 3380 wrote to memory of 2312	3380	buildz.exe	74
PID 3380 wrote to memory of 2312	3380	buildz.exe	74
PID 3380 wrote to memory of 2312	3380	buildz.exe	74
PID 3380 wrote to memory of 2312	3380	buildz.exe	74
PID 3380 wrote to memory of 2312	3380	buildz.exe	74
PID 3380 wrote to memory of 2312	3380	buildz.exe	74
PID 3380 wrote to memory of 2312	3380	buildz.exe	74
PID 2312 wrote to memory of 4876	2312	buildz.exe	75
PID 2312 wrote to memory of 4876	2312	buildz.exe	75
PID 2312 wrote to memory of 4876	2312	buildz.exe	75
PID 2312 wrote to memory of 224	2312	buildz.exe	76
PID 2312 wrote to memory of 224	2312	buildz.exe	76
PID 2312 wrote to memory of 224	2312	buildz.exe	76
PID 224 wrote to memory of 4824	224	buildz.exe	78
PID 224 wrote to memory of 4824	224	buildz.exe	78
PID 224 wrote to memory of 4824	224	buildz.exe	78
PID 224 wrote to memory of 4824	224	buildz.exe	78
PID 224 wrote to memory of 4824	224	buildz.exe	78
PID 224 wrote to memory of 4824	224	buildz.exe	78
PID 224 wrote to memory of 4824	224	buildz.exe	78
PID 224 wrote to memory of 4824	224	buildz.exe	78
PID 224 wrote to memory of 4824	224	buildz.exe	78
PID 224 wrote to memory of 4824	224	buildz.exe	78
PID 4824 wrote to memory of 3256	4824	buildz.exe	79
PID 4824 wrote to memory of 3256	4824	buildz.exe	79
PID 4824 wrote to memory of 3256	4824	buildz.exe	79
PID 3256 wrote to memory of 1620	3256	build2.exe	80
PID 3256 wrote to memory of 1620	3256	build2.exe	80
PID 3256 wrote to memory of 1620	3256	build2.exe	80
PID 3256 wrote to memory of 1620	3256	build2.exe	80
PID 3256 wrote to memory of 1620	3256	build2.exe	80
PID 3256 wrote to memory of 1620	3256	build2.exe	80
PID 3256 wrote to memory of 1620	3256	build2.exe	80
PID 3256 wrote to memory of 1620	3256	build2.exe	80
PID 3256 wrote to memory of 1620	3256	build2.exe	80
PID 3256 wrote to memory of 1620	3256	build2.exe	80

C:\Users\Admin\AppData\Local\Temp\buildz.exe
"C:\Users\Admin\AppData\Local\Temp\buildz.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3380
- C:\Users\Admin\AppData\Local\Temp\buildz.exe
  "C:\Users\Admin\AppData\Local\Temp\buildz.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2312
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\6cd87798-a58c-41a1-9ecf-b08746f7b2ec" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:4876
- - C:\Users\Admin\AppData\Local\Temp\buildz.exe
    "C:\Users\Admin\AppData\Local\Temp\buildz.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:224
  - - C:\Users\Admin\AppData\Local\Temp\buildz.exe
      "C:\Users\Admin\AppData\Local\Temp\buildz.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of WriteProcessMemory
      PID:4824
    - - C:\Users\Admin\AppData\Local\e0528225-51e0-4528-8d6b-f37335ac6e17\build2.exe
        
        "C:\Users\Admin\AppData\Local\e0528225-51e0-4528-8d6b-f37335ac6e17\build2.exe"
        5⤵
        Executes dropped EXE
        Suspicious use of SetThreadContext
        Suspicious use of WriteProcessMemory
        
        PID:3256
      - C:\Users\Admin\AppData\Local\e0528225-51e0-4528-8d6b-f37335ac6e17\build2.exe
        
        "C:\Users\Admin\AppData\Local\e0528225-51e0-4528-8d6b-f37335ac6e17\build2.exe"
        6⤵
        Executes dropped EXE
        
        PID:1620
        
        C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 1620 -s 1912
        7⤵
        Program crash
        
        PID:2404

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

File and Directory Permissions Modification

T1222

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA

Filesize
1KB

MD5
4887e5c213b9a196b1e5f9bdc16f8048

SHA1
e8e9d7e44f6702e33a44e8ce90518500392dbc47

SHA256
10d47f70b1a3a7f9112bd231bcaede46d39be5480c61a6fbc1fc45cae8788880

SHA512
9c74a4bcfa65a82d3bb0c78ed02e2c8dab502c21fedfebd613fa3e89e6c50ebf8b290e82a3a7ae9fb77f8877aa50e217ab1a0207518253681f9379855b0d30e8

Download Submit
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

Filesize
724B

MD5
8202a1cd02e7d69597995cabbe881a12

SHA1
8858d9d934b7aa9330ee73de6c476acf19929ff6

SHA256
58f381c3a0a0ace6321da22e40bd44a597bd98b9c9390ab9258426b5cf75a7a5

SHA512
97ba9fceab995d4bef706f8deef99e06862999734ebe6a05832c710104479c6337cbf0a76e1c1e0f91566a61334dc100d837dfd049e20da765fe49def684f9c9

Download Submit
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA

Filesize
410B

MD5
f323d9daffb82591451021a018e0ca1d

SHA1
3b9a4932a3426795ab30f0e67ec665e58ea2380b

SHA256
8b0b6a70c9e35c64191edcde070688e1b556584388fc35cf001d82997fae0c4b

SHA512
eff404a0aad85d6b681a4c0a498f2072f59e1e5639ab7ed0625644a6bc828baa154c38e6e83da694bbfd3837746450ee7e2fdf2b38f83c202d8ed9ea89fe3caf

Download Submit
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

Filesize
392B

MD5
c3253e7387271b6b258566601ddcabfa

SHA1
d3ca57fc8914797454bdbf80c81025b201ec47eb

SHA256
bef7f0950d12a5c1077f2d9c71b00717bda862a7e9c82c91db9884f06178c499

SHA512
de491be40abc3c09680684cfdb24f250a004a69623be7b1f141f630e91dbba184788aa0958593ccb9debca3514481a8d2dd1a376a51de291b193d88045c9d196

Download Submit
C:\Users\Admin\AppData\Local\6cd87798-a58c-41a1-9ecf-b08746f7b2ec\buildz.exe

Filesize
114KB

MD5
5fecb1b082de4b380bd178d135b35af6

SHA1
da3dc4d70992b6b5d0c813f871ff9b2dd3080369

SHA256
a1b3ef4e6a97fe05f6474dbad514dfedd48927bc53cd5993abb46d9439a0ec62

SHA512
3a6c7f5ef2a6a51a574226acd526b42c7b828e29fd9ac35d1ba671297dc73726e6eabb04db4b52016de0649c9c618663124afb282b2653b903eef135f3c9dede

Download Submit
C:\Users\Admin\AppData\Local\e0528225-51e0-4528-8d6b-f37335ac6e17\build2.exe

Filesize
277KB

MD5
8dae8b6a6be6e3527183594d1c26a2d3

SHA1
b87e40cee60869a36e79c88c8a3a34baf0bc4889

SHA256
afce72cd3bc717c784962083066e3ede2b0aaadbe0908ec7360096c923774fa5

SHA512
0bf065700db647efba39a13a58242a595907e6c11885575cf0bdad9e23ab40583c8a6535464e46d75d075e20d88b7a6305a761df9da787fdc8728483dd48f96e

Download Submit
C:\Users\Admin\AppData\Local\e0528225-51e0-4528-8d6b-f37335ac6e17\build2.exe

Filesize
275KB

MD5
066a6752ec91aec993eb7b229471829a

SHA1
75d92b9b7bb1de5469090ead96ada3716da971e3

SHA256
1d06053059d84223b210c6e55a5a111a4bc2f012d833edb04f1c18f4330f36f9

SHA512
6ae5ae5d3a4e53e4ae391827f3734610d593897ddd7ea687b0526521a6b8045abdce4d8232f646d44d88241b51bbacab70e856b4d53eba3f7f74a06fb0444f39

Download Submit
memory/224-59-0x0000000002260000-0x00000000022FA000-memory.dmp

Filesize
616KB

Download
memory/224-22-0x0000000002260000-0x00000000022FA000-memory.dmp

Filesize
616KB

Download
memory/1620-52-0x0000000000400000-0x0000000000644000-memory.dmp

Filesize
2.3MB

Download
memory/1620-58-0x0000000000400000-0x0000000000644000-memory.dmp

Filesize
2.3MB

Download
memory/1620-50-0x0000000000400000-0x0000000000644000-memory.dmp

Filesize
2.3MB

Download
memory/1620-46-0x0000000000400000-0x0000000000644000-memory.dmp

Filesize
2.3MB

Download
memory/2312-3-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2312-6-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2312-17-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2312-1-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2312-5-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3256-62-0x00000000021B0000-0x00000000021E1000-memory.dmp

Filesize
196KB

Download
memory/3256-49-0x0000000000710000-0x0000000000810000-memory.dmp

Filesize
1024KB

Download
memory/3256-51-0x00000000021B0000-0x00000000021E1000-memory.dmp

Filesize
196KB

Download
memory/3380-4-0x00000000023E0000-0x00000000024FB000-memory.dmp

Filesize
1.1MB

Download
memory/3380-2-0x0000000000770000-0x0000000000804000-memory.dmp

Filesize
592KB

Download
memory/4824-34-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4824-37-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4824-36-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4824-30-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4824-29-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4824-56-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4824-23-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4824-24-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4824-21-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4824-90-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download