djvu | bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2

Analysis

max time kernel
117s
max time network
118s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
08/01/2025, 19:50

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General

Target

bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe
Size

766KB
MD5

2cb8c190f4cc23501bc6965d9d762977
SHA1

3b6f667d28eec165a2ccfaed4fb3cf87084b06ed
SHA256

bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2
SHA512

295dee006e2d991ffc6b8016a02a2e171973552527bfa3c040f91aabb46c2233c62dbf41dec0d97db61ac1f145c875f79a3bfa28c09b74c1ed23016abd729697
SSDEEP

12288:nKDiXNmHNpcGWH69SIW5JBvOwcMBl4tT5jVXctOpctHni7LEwvn:nMiXNKNpM6jW5JDcIit+OpAHUEw/

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Extracted

Family

djvu

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

Attributes

extension
.held
offline_id
vyhLHcV0DMKjS0CgDoJGF0yJ299laBK7lZQM9Tt1
payload_url
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. 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: 0879held

rsa_pubkey.plain

Signatures

Detected Djvu ransomware 15 IoCs

resource	yara_rule
behavioral1/memory/2520-2-0x00000000021A0000-0x00000000022BB000-memory.dmp	family_djvu
behavioral1/memory/2172-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2172-8-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2172-9-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2172-27-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2912-35-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2912-33-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2912-47-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2912-49-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2912-48-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2912-51-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2912-57-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2912-59-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2912-60-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2912-61-0x0000000000400000-0x0000000000537000-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
2904	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-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\6e64a241-e4bd-483b-9ea9-7edb05275002\\bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe\" --AutoStart"	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.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
5	api.2ip.ua
9	api.2ip.ua
4	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2520 set thread context of 2172	2520	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	30
PID 2744 set thread context of 2912	2744	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.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	icacls.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2172	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe
2172	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe
2912	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe
2912	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2520 wrote to memory of 2172	2520	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	30
PID 2520 wrote to memory of 2172	2520	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	30
PID 2520 wrote to memory of 2172	2520	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	30
PID 2520 wrote to memory of 2172	2520	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	30
PID 2520 wrote to memory of 2172	2520	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	30
PID 2520 wrote to memory of 2172	2520	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	30
PID 2520 wrote to memory of 2172	2520	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	30
PID 2520 wrote to memory of 2172	2520	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	30
PID 2520 wrote to memory of 2172	2520	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	30
PID 2520 wrote to memory of 2172	2520	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	30
PID 2520 wrote to memory of 2172	2520	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	30
PID 2172 wrote to memory of 2904	2172	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	32
PID 2172 wrote to memory of 2904	2172	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	32
PID 2172 wrote to memory of 2904	2172	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	32
PID 2172 wrote to memory of 2904	2172	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	32
PID 2172 wrote to memory of 2744	2172	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	33
PID 2172 wrote to memory of 2744	2172	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	33
PID 2172 wrote to memory of 2744	2172	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	33
PID 2172 wrote to memory of 2744	2172	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	33
PID 2744 wrote to memory of 2912	2744	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	34
PID 2744 wrote to memory of 2912	2744	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	34
PID 2744 wrote to memory of 2912	2744	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	34
PID 2744 wrote to memory of 2912	2744	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	34
PID 2744 wrote to memory of 2912	2744	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	34
PID 2744 wrote to memory of 2912	2744	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	34
PID 2744 wrote to memory of 2912	2744	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	34
PID 2744 wrote to memory of 2912	2744	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	34
PID 2744 wrote to memory of 2912	2744	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	34
PID 2744 wrote to memory of 2912	2744	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	34
PID 2744 wrote to memory of 2912	2744	bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe	34

C:\Users\Admin\AppData\Local\Temp\bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe
"C:\Users\Admin\AppData\Local\Temp\bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2520
- C:\Users\Admin\AppData\Local\Temp\bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe
  "C:\Users\Admin\AppData\Local\Temp\bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe"
  2⤵
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2172
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\6e64a241-e4bd-483b-9ea9-7edb05275002" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    - System Location Discovery: System Language Discovery
    PID:2904
- - C:\Users\Admin\AppData\Local\Temp\bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe
    "C:\Users\Admin\AppData\Local\Temp\bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2744
  - - C:\Users\Admin\AppData\Local\Temp\bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe
      "C:\Users\Admin\AppData\Local\Temp\bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      PID:2912

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
300620d85bae4aaabf127aa12b5192a0

SHA1
da9e7a9d911e970a36e4b7975d00d1754c218e4d

SHA256
d87ae2f31047aa611ab3fcf63522bbc47a77dde03c261ade05aaaf3a38d75fc7

SHA512
e03845af1127deb2bdc32312adc2d59179eb088d334966ef6ab35817103a7d20f7ecff422e54edec937d65b68b3da479e265880d40ff305b9487c342c2ea1aa2

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

Filesize
170B

MD5
4c3562d55ba5d7e8a99ad19f9f560f58

SHA1
e940f1ce0b6d147c9d36148fb323647444723ea0

SHA256
47412308c10a82fe3db33c04d5886ffdb0b42b367fa4114b951bfc5d937ac6a4

SHA512
df112e89ebbe20dce6050f742722537d390d262f7b314b3c2c25a23abb7f95f7a775486eba64f21558766c56304c3e5d753a41f323db27936f477f58c2682c33

Download Submit
C:\Users\Admin\AppData\Local\6e64a241-e4bd-483b-9ea9-7edb05275002\bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2.exe

Filesize
766KB

MD5
2cb8c190f4cc23501bc6965d9d762977

SHA1
3b6f667d28eec165a2ccfaed4fb3cf87084b06ed

SHA256
bce72535b8dfbb5eb44507956b9795e4331b2f991147902938d9c631fe0515b2

SHA512
295dee006e2d991ffc6b8016a02a2e171973552527bfa3c040f91aabb46c2233c62dbf41dec0d97db61ac1f145c875f79a3bfa28c09b74c1ed23016abd729697

Download Submit
C:\Users\Admin\AppData\Local\Temp\CabC929.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
memory/2172-9-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2172-5-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2172-8-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2172-27-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2172-3-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2520-0-0x0000000002050000-0x00000000020E1000-memory.dmp

Filesize
580KB

Download
memory/2520-1-0x0000000002050000-0x00000000020E1000-memory.dmp

Filesize
580KB

Download
memory/2520-2-0x00000000021A0000-0x00000000022BB000-memory.dmp

Filesize
1.1MB

Download
memory/2520-6-0x0000000002050000-0x00000000020E1000-memory.dmp

Filesize
580KB

Download
memory/2744-50-0x0000000000400000-0x0000000000898000-memory.dmp

Filesize
4.6MB

Download
memory/2744-34-0x0000000000400000-0x0000000000898000-memory.dmp

Filesize
4.6MB

Download
memory/2744-28-0x00000000008A0000-0x0000000000931000-memory.dmp

Filesize
580KB

Download
memory/2912-33-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2912-35-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2912-47-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2912-49-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2912-48-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2912-51-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2912-57-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2912-59-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2912-60-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2912-61-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download