djvu | b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7

Analysis

max time kernel
143s
max time network
125s
platform
windows11-21h2_x64
resource
win11-20240419-en
resource tags

arch:x64arch:x86image:win11-20240419-enlocale:en-usos:windows11-21h2-x64system
submitted
26/05/2024, 16:11

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General

Target
b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe
Size 759KB
Sample240526-tm3bdacc3t
SHA256 b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7
MD5 8fd825c04db6b70aa798db55e5ff7a1f
SHA1 eac1abcfc3d0ee1992006f18ddf4adcd2040ac03
SHA512 8e5f55847084632855fa92747352cd8490917e0fe4188d041c26dd25699113c4eac05e3d03121173c6f44bbc61854e3fc5d0099bfe5d75a03c772970349cc6fb
SSDEEP 12288:Qjt/42KqZrfwR/2MWNNthNUTtSuSIpzJF/wTInSE5VTdka:QjOz2TtWT0Yz3/wTIS8VTea
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Extracted

Family

djvu

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

Attributes

extension
.vepi
offline_id
EGfa5svnSGFJka7LZBQoqff0QtO1IpTauoDvGvt1
payload_url
http://sdfjhuz.com/dl/build2.exe

http://cajgtus.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/33b490a613f49fa190924f199d2c079e20240512191214/caaf73 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: 0871PsawqS

rsa_pubkey.plain

Signatures

Detected Djvu ransomware 15 IoCs

resource	yara_rule
behavioral2/memory/1628-2-0x0000000004B00000-0x0000000004C1B000-memory.dmp	family_djvu
behavioral2/memory/3288-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3288-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3288-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3288-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3288-19-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3248-22-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3248-27-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3248-28-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3248-29-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3248-31-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3248-34-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3248-33-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3248-35-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3248-37-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu

Djvu Ransomware
Ransomware which is a variant of the STOP family.
ransomware djvu

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
2476	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-1-5-21-1474490143-3221292397-4168103503-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\20438e3f-3a10-4d97-869d-4ac51c25f796\\b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe\" --AutoStart"	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.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
1	api.2ip.ua
2	api.2ip.ua
6	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1628 set thread context of 3288	1628	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	80
PID 4036 set thread context of 3248	4036	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	86

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3288	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe
3288	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe
3248	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe
3248	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 1628 wrote to memory of 3288	1628	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	80
PID 1628 wrote to memory of 3288	1628	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	80
PID 1628 wrote to memory of 3288	1628	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	80
PID 1628 wrote to memory of 3288	1628	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	80
PID 1628 wrote to memory of 3288	1628	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	80
PID 1628 wrote to memory of 3288	1628	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	80
PID 1628 wrote to memory of 3288	1628	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	80
PID 1628 wrote to memory of 3288	1628	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	80
PID 1628 wrote to memory of 3288	1628	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	80
PID 1628 wrote to memory of 3288	1628	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	80
PID 3288 wrote to memory of 2476	3288	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	82
PID 3288 wrote to memory of 2476	3288	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	82
PID 3288 wrote to memory of 2476	3288	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	82
PID 3288 wrote to memory of 4036	3288	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	83
PID 3288 wrote to memory of 4036	3288	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	83
PID 3288 wrote to memory of 4036	3288	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	83
PID 4036 wrote to memory of 3248	4036	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	86
PID 4036 wrote to memory of 3248	4036	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	86
PID 4036 wrote to memory of 3248	4036	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	86
PID 4036 wrote to memory of 3248	4036	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	86
PID 4036 wrote to memory of 3248	4036	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	86
PID 4036 wrote to memory of 3248	4036	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	86
PID 4036 wrote to memory of 3248	4036	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	86
PID 4036 wrote to memory of 3248	4036	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	86
PID 4036 wrote to memory of 3248	4036	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	86
PID 4036 wrote to memory of 3248	4036	b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe	86

C:\Users\Admin\AppData\Local\Temp\b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe
"C:\Users\Admin\AppData\Local\Temp\b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1628
- C:\Users\Admin\AppData\Local\Temp\b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe
  "C:\Users\Admin\AppData\Local\Temp\b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:3288
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\20438e3f-3a10-4d97-869d-4ac51c25f796" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:2476
- - C:\Users\Admin\AppData\Local\Temp\b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe
    "C:\Users\Admin\AppData\Local\Temp\b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:4036
  - - C:\Users\Admin\AppData\Local\Temp\b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe
      "C:\Users\Admin\AppData\Local\Temp\b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:3248

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

24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
Size 1KB
SHA256 63c5ec564440d74f3c2c2a161a66a22dbf30b03659f3309419a359ee1f8c0d4e
MD5 beba3522cd7eb77a09fe36abcb252a4f
SHA1 220cb347af597d4f8aacacff27eb0ce64207e99b
SHA512 35eb19b0e1061370a951b1ca3f66288c6ed1732ce7c94fc663eb3959383e0f5d8fc28b3ab1cb9f5f3cb75a314c3d1a0a62694f51490760ea88e8772916f49774
MD5 SHA1 SHA512

Submit Download

CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
Size 724B
SHA256 58f381c3a0a0ace6321da22e40bd44a597bd98b9c9390ab9258426b5cf75a7a5
MD5 8202a1cd02e7d69597995cabbe881a12
SHA1 8858d9d934b7aa9330ee73de6c476acf19929ff6
SHA512 97ba9fceab995d4bef706f8deef99e06862999734ebe6a05832c710104479c6337cbf0a76e1c1e0f91566a61334dc100d837dfd049e20da765fe49def684f9c9
MD5 SHA1 SHA512

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24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
Size 410B
SHA256 a218e021b4780a60c549aba67bff3f070e0c31f5ec49729eb81c280338e455f9
MD5 ed98240f55270cac66c0a64a2fabd828
SHA1 b34b96a743531ce8ed7cc0bcbda299a0be13cf80
SHA512 a2571adea95b13bcb5ea2e9ab202cb0bd4404b42c1a0fa0e4ebeddfccb2fa2c64506b747f9b154ca071539bdb004a62d64284814d982cb07218dcbefb2202819
MD5 SHA1 SHA512

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CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
Size 392B
SHA256 f4e40dc0feb1ab2158d315d6fc6683dee172c8d818e0681599fb63d0c1904109
MD5 20421f299caa121bc6d426d715f29ef1
SHA1 542b41a5398ad9e6637a62730116cb1301f26953
SHA512 def468c5af9acb7419aa11e49e25c7963382c722721b6d0c30213ba6560737d1e01524028fbf5db020d79588005309a3aebf205e21a697051d3882b6e7cf882d
MD5 SHA1 SHA512

Submit Download

b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe

Path C:\Users\Admin\AppData\Local\20438e3f-3a10-4d97-869d-4ac51c25f796\b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7.exe
Size 759KB
SHA256 b7b8c081d10f54b93aa9088d3a928f6606aecf6a36c6581978ddda74117102c7
MD5 8fd825c04db6b70aa798db55e5ff7a1f
SHA1 eac1abcfc3d0ee1992006f18ddf4adcd2040ac03
SHA512 8e5f55847084632855fa92747352cd8490917e0fe4188d041c26dd25699113c4eac05e3d03121173c6f44bbc61854e3fc5d0099bfe5d75a03c772970349cc6fb
SSDEEP 12288:Qjt/42KqZrfwR/2MWNNthNUTtSuSIpzJF/wTInSE5VTdka:QjOz2TtWT0Yz3/wTIS8VTea
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1628-2-0x0000000004B00000-0x0000000004C1B000-memory.dmp

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memory/1628-1-0x0000000004A50000-0x0000000004AF1000-memory.dmp

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memory/3248-29-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3248-34-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3248-37-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3248-35-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3248-33-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3248-22-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3248-27-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3248-28-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3248-31-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3288-4-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3288-5-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3288-3-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3288-6-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3288-19-0x0000000000400000-0x0000000000537000-memory.dmp

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