djvu | 8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c

Analysis

max time kernel
144s
max time network
121s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
18/03/2025, 06:08

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General

Target

8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe
Size

763KB
MD5

19f46c713419f534c1532645b764c7b4
SHA1

f61f07d60704ff3d843596a6068b12f565bbed23
SHA256

8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c
SHA512

595bad474662dd1e1cdbdec310c96b42201443d07c975a96c8d0bddb6f08714b55383aec213106424201be6304e7c620e696c54ee70ff8027c11f1cf129a08f4
SSDEEP

12288:Ck30NbksICSr1WWknJ7RHWaqrx3A4VpRZZTLpu02zSa8wQR1oFqVDNmw/oI9wIG:kksIjr1EJ7R2aqN3zbFTM02zFW1TDLiz

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Extracted

Family

djvu

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

Attributes

extension
.bgjs
offline_id
Z6iwSvCoAt8T8K2ROxecuXHPNHv7eDyWrc8Ks7t1
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/54cdfd152fe98eedb628a1f4ddb7076420240421150208/403a27 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: 0863PsawqS

rsa_pubkey.plain

Signatures

Detected Djvu ransomware 14 IoCs

resource	yara_rule
behavioral1/memory/1148-2-0x00000000040B0000-0x00000000041CB000-memory.dmp	family_djvu
behavioral1/memory/2220-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2220-7-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2220-8-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2220-27-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2768-30-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2768-43-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2768-42-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2768-44-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2768-51-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2768-50-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2768-48-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2768-52-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2768-53-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu

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

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
2820	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-1-5-21-4177215427-74451935-3209572229-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\6953132b-87c4-44fe-9ff1-6e11a7d53197\\8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe\" --AutoStart"	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.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
4	api.2ip.ua
5	api.2ip.ua
9	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1148 set thread context of 2220	1148	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	30
PID 2876 set thread context of 2768	2876	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	34

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 5 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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	icacls.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2220	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe
2220	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe
2768	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe
2768	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1148 wrote to memory of 2220	1148	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	30
PID 1148 wrote to memory of 2220	1148	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	30
PID 1148 wrote to memory of 2220	1148	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	30
PID 1148 wrote to memory of 2220	1148	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	30
PID 1148 wrote to memory of 2220	1148	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	30
PID 1148 wrote to memory of 2220	1148	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	30
PID 1148 wrote to memory of 2220	1148	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	30
PID 1148 wrote to memory of 2220	1148	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	30
PID 1148 wrote to memory of 2220	1148	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	30
PID 1148 wrote to memory of 2220	1148	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	30
PID 1148 wrote to memory of 2220	1148	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	30
PID 2220 wrote to memory of 2820	2220	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	32
PID 2220 wrote to memory of 2820	2220	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	32
PID 2220 wrote to memory of 2820	2220	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	32
PID 2220 wrote to memory of 2820	2220	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	32
PID 2220 wrote to memory of 2876	2220	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	33
PID 2220 wrote to memory of 2876	2220	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	33
PID 2220 wrote to memory of 2876	2220	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	33
PID 2220 wrote to memory of 2876	2220	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	33
PID 2876 wrote to memory of 2768	2876	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	34
PID 2876 wrote to memory of 2768	2876	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	34
PID 2876 wrote to memory of 2768	2876	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	34
PID 2876 wrote to memory of 2768	2876	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	34
PID 2876 wrote to memory of 2768	2876	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	34
PID 2876 wrote to memory of 2768	2876	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	34
PID 2876 wrote to memory of 2768	2876	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	34
PID 2876 wrote to memory of 2768	2876	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	34
PID 2876 wrote to memory of 2768	2876	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	34
PID 2876 wrote to memory of 2768	2876	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	34
PID 2876 wrote to memory of 2768	2876	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	34

C:\Users\Admin\AppData\Local\Temp\8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe
"C:\Users\Admin\AppData\Local\Temp\8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1148
- C:\Users\Admin\AppData\Local\Temp\8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe
  "C:\Users\Admin\AppData\Local\Temp\8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe"
  2⤵
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2220
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\6953132b-87c4-44fe-9ff1-6e11a7d53197" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    - System Location Discovery: System Language Discovery
    PID:2820
- - C:\Users\Admin\AppData\Local\Temp\8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe
    "C:\Users\Admin\AppData\Local\Temp\8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2876
  - - C:\Users\Admin\AppData\Local\Temp\8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe
      "C:\Users\Admin\AppData\Local\Temp\8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      PID:2768

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

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\8B2B9A00839EED1DFDCCC3BFC2F5DF12

Filesize
1KB

MD5
c9be626e9715952e9b70f92f912b9787

SHA1
aa2e946d9ad9027172d0d321917942b7562d6abe

SHA256
c13e8d22800c200915f87f71c31185053e4e60ca25de2e41e160e09cd2d815d4

SHA512
7581b7c593785380e9db3ae760af85c1a889f607a3cd2aa5a2695a0e5a0fe8ee751578e88f7d8c997faeda804e2fc2655d859bee2832eace526ed4379edaa3f5

Download Submit
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B46811C17859FFB409CF0E904A4AA8F8

Filesize
436B

MD5
971c514f84bba0785f80aa1c23edfd79

SHA1
732acea710a87530c6b08ecdf32a110d254a54c8

SHA256
f157ed17fcaf8837fa82f8b69973848c9b10a02636848f995698212a08f31895

SHA512
43dc1425d80e170c645a3e3bb56da8c3acd31bd637329e9e37094ac346ac85434df4edcdbefc05ae00aea33a80a88e2af695997a495611217fe6706075a63c58

Download Submit
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\8B2B9A00839EED1DFDCCC3BFC2F5DF12

Filesize
174B

MD5
39a3e1913844cd40a38bd8dd5bee559a

SHA1
77a940e2119d2809f5eabfdca236c422a0913fd2

SHA256
ffb499ffa26bcbd76177c0b41f4697a66c51a4800a1ed405833c1141a421e7e2

SHA512
d12adc5937247e89197802abfd8ddce88d88d0824cd00d819875d5e3948aa397ff3d04ed1e527bb62c415e12a457ae3dd667bb045fd99256b9ed454af22024d8

Download Submit
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B46811C17859FFB409CF0E904A4AA8F8

Filesize
170B

MD5
507e39432bf9c590f38a2a60dbcba961

SHA1
b81e04e1a1067b72dbbd7d948346b86a498f54ad

SHA256
b335eb2d960020e251c6bae8658152b8e8cd010c1384ffb1ac066360477865de

SHA512
450c25bbf598da68ab4498b52a2fa86dcefad5c96a74404dc9b00164faa434f7b274b3f23f3a34733981b6c32af2999f00a03fcd69d279fb1d95663ec8f11178

Download Submit
C:\Users\Admin\AppData\Local\6953132b-87c4-44fe-9ff1-6e11a7d53197\8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe

Filesize
763KB

MD5
19f46c713419f534c1532645b764c7b4

SHA1
f61f07d60704ff3d843596a6068b12f565bbed23

SHA256
8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c

SHA512
595bad474662dd1e1cdbdec310c96b42201443d07c975a96c8d0bddb6f08714b55383aec213106424201be6304e7c620e696c54ee70ff8027c11f1cf129a08f4

Download Submit
C:\Users\Admin\AppData\Local\Temp\CabC735.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
memory/1148-2-0x00000000040B0000-0x00000000041CB000-memory.dmp

Filesize
1.1MB

Download
memory/1148-1-0x0000000000220000-0x00000000002B2000-memory.dmp

Filesize
584KB

Download
memory/1148-0-0x0000000000220000-0x00000000002B2000-memory.dmp

Filesize
584KB

Download
memory/2220-8-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2220-3-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2220-5-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2220-27-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2220-7-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2768-43-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2768-30-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2768-42-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2768-44-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2768-51-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2768-50-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2768-48-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2768-52-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2768-53-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2876-26-0x0000000000220000-0x00000000002B2000-memory.dmp

Filesize
584KB

Download