djvu | 350c038a1e1d9c2eed1f94fac6f7cab62266bffe9c26c7d7387f27d69c378b42

Analysis

max time kernel
143s
max time network
146s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
22-12-2024 09:40

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General

Target

sample.exe
Size

824KB
MD5

24c8011aeb1714e43f7eea47dbfa1daa
SHA1

44012799fcfd02ac89a4469a047c72f3bb9485ba
SHA256

eb7decebf8226f98cd64580f6ab6d001ddf7dc1c7cd28cd3c6175c505b13dc2f
SHA512

d771c86573f5051610e3bc14030614df56741fa1c2bdd3304a5088e99335b9fb2cada32d8f3d43dce74f12eba3e8946206247f480c0f06d7d516f700759fa9ee
SSDEEP

24576:SvlXzMoyhMQZF4w/ZR+B3OG+FSyHQiA/tB:4ljMoerFRa+GmvHQiA

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Extracted

Family

djvu

http://fuyt.org/test3/get.php

Attributes

extension
.ygvb
offline_id
PfLhykvDxmCghCq8peuxBtQ3c0QBuANi8WUkuet1
payload_url
http://zerit.top/dl/build2.exe

http://fuyt.org/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. You can get and look video overview decrypt tool: https://we.tl/t-c565B1ILoZ Price of private key and decrypt software is $980. Discount 50% available if you contact us first 72 hours, that's price for you is $490. 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: 0452Jbdio

rsa_pubkey.plain

Signatures

Detected Djvu ransomware 15 IoCs

resource	yara_rule
behavioral1/memory/1960-2-0x0000000001DD0000-0x0000000001EEB000-memory.dmp	family_djvu
behavioral1/memory/1116-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1116-9-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1116-7-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1116-27-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1904-35-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1904-36-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1904-48-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1904-49-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1904-50-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1904-54-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1904-63-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1904-66-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1904-65-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1904-67-0x0000000000400000-0x0000000000537000-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
2924	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-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\39a5fa47-825f-4a9f-99b4-89b5a51a608b\\sample.exe\" --AutoStart"	sample.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 1960 set thread context of 1116	1960	sample.exe	31
PID 2824 set thread context of 1904	2824	sample.exe	35

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	sample.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sample.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sample.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sample.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	icacls.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1116	sample.exe
1116	sample.exe
1904	sample.exe
1904	sample.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1960 wrote to memory of 1116	1960	sample.exe	31
PID 1960 wrote to memory of 1116	1960	sample.exe	31
PID 1960 wrote to memory of 1116	1960	sample.exe	31
PID 1960 wrote to memory of 1116	1960	sample.exe	31
PID 1960 wrote to memory of 1116	1960	sample.exe	31
PID 1960 wrote to memory of 1116	1960	sample.exe	31
PID 1960 wrote to memory of 1116	1960	sample.exe	31
PID 1960 wrote to memory of 1116	1960	sample.exe	31
PID 1960 wrote to memory of 1116	1960	sample.exe	31
PID 1960 wrote to memory of 1116	1960	sample.exe	31
PID 1960 wrote to memory of 1116	1960	sample.exe	31
PID 1116 wrote to memory of 2924	1116	sample.exe	33
PID 1116 wrote to memory of 2924	1116	sample.exe	33
PID 1116 wrote to memory of 2924	1116	sample.exe	33
PID 1116 wrote to memory of 2924	1116	sample.exe	33
PID 1116 wrote to memory of 2824	1116	sample.exe	34
PID 1116 wrote to memory of 2824	1116	sample.exe	34
PID 1116 wrote to memory of 2824	1116	sample.exe	34
PID 1116 wrote to memory of 2824	1116	sample.exe	34
PID 2824 wrote to memory of 1904	2824	sample.exe	35
PID 2824 wrote to memory of 1904	2824	sample.exe	35
PID 2824 wrote to memory of 1904	2824	sample.exe	35
PID 2824 wrote to memory of 1904	2824	sample.exe	35
PID 2824 wrote to memory of 1904	2824	sample.exe	35
PID 2824 wrote to memory of 1904	2824	sample.exe	35
PID 2824 wrote to memory of 1904	2824	sample.exe	35
PID 2824 wrote to memory of 1904	2824	sample.exe	35
PID 2824 wrote to memory of 1904	2824	sample.exe	35
PID 2824 wrote to memory of 1904	2824	sample.exe	35
PID 2824 wrote to memory of 1904	2824	sample.exe	35

C:\Users\Admin\AppData\Local\Temp\sample.exe
"C:\Users\Admin\AppData\Local\Temp\sample.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1960
- C:\Users\Admin\AppData\Local\Temp\sample.exe
  "C:\Users\Admin\AppData\Local\Temp\sample.exe"
  2⤵
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:1116
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\39a5fa47-825f-4a9f-99b4-89b5a51a608b" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    - System Location Discovery: System Language Discovery
    PID:2924
- - C:\Users\Admin\AppData\Local\Temp\sample.exe
    "C:\Users\Admin\AppData\Local\Temp\sample.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2824
  - - C:\Users\Admin\AppData\Local\Temp\sample.exe
      "C:\Users\Admin\AppData\Local\Temp\sample.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      PID:1904

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
67e486b2f148a3fca863728242b6273e

SHA1
452a84c183d7ea5b7c015b597e94af8eef66d44a

SHA256
facaf1c3a4bf232abce19a2d534e495b0d3adc7dbe3797d336249aa6f70adcfb

SHA512
d3a37da3bb10a9736dc03e8b2b49baceef5d73c026e2077b8ebc1b786f2c9b2f807e0aa13a5866cf3b3cafd2bc506242ef139c423eaffb050bbb87773e53881e

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
54f59836393b596125217afbf3fb4cfc

SHA1
14a3db3ec9b0f02523722486a81ec8a6393e2c68

SHA256
6a54cc6b0969cd5b8530c7fc4dd2de141beab314a4e65008ef403a246b922cbb

SHA512
759b6277d50443ec75975904fadcaf858126797e7b13908404b4172197334a2d9d908b0ecf1f73f52d0a302a7f1942b2c4792d0dfd875629d6ec303041e9cdfc

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

Filesize
170B

MD5
843f73d2a2143a1c25cfdbdc61ecc6ed

SHA1
2d723ea6d43a469c28522ee87a5d98bc3391c58b

SHA256
3fc4ce64b39685f98d47317939c7097b423b507b9f85f3722099dfd32264b757

SHA512
bd9930908eaacbfdec26c968e0d7a9bf76c6ad1ca348082a1a1ef8738db060fc9bdb0e7e84a6c33e4dff4f829288f35833d9917fc024fc9bd73aa9e6898b11fa

Download Submit
C:\Users\Admin\AppData\Local\39a5fa47-825f-4a9f-99b4-89b5a51a608b\sample.exe

Filesize
824KB

MD5
24c8011aeb1714e43f7eea47dbfa1daa

SHA1
44012799fcfd02ac89a4469a047c72f3bb9485ba

SHA256
eb7decebf8226f98cd64580f6ab6d001ddf7dc1c7cd28cd3c6175c505b13dc2f

SHA512
d771c86573f5051610e3bc14030614df56741fa1c2bdd3304a5088e99335b9fb2cada32d8f3d43dce74f12eba3e8946206247f480c0f06d7d516f700759fa9ee

Download Submit
C:\Users\Admin\AppData\Local\Temp\Cab141D.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
memory/1116-3-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1116-5-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1116-9-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1116-7-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1116-27-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1904-36-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1904-63-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1904-35-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1904-67-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1904-65-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1904-66-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1904-54-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1904-50-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1904-49-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1904-48-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1960-1-0x0000000000300000-0x0000000000391000-memory.dmp

Filesize
580KB

Download
memory/1960-2-0x0000000001DD0000-0x0000000001EEB000-memory.dmp

Filesize
1.1MB

Download
memory/1960-8-0x0000000000300000-0x0000000000391000-memory.dmp

Filesize
580KB

Download
memory/1960-0-0x0000000000300000-0x0000000000391000-memory.dmp

Filesize
580KB

Download
memory/2824-33-0x0000000000400000-0x00000000004D9000-memory.dmp

Filesize
868KB

Download
memory/2824-28-0x00000000002B0000-0x0000000000341000-memory.dmp

Filesize
580KB

Download
memory/2824-29-0x0000000000400000-0x00000000004D9000-memory.dmp

Filesize
868KB

Download