djvu | b61fbbd592f750f0b85f955d69321b9eef03aa41e4bb8cc08562ff6f38ad38f0

Analysis

max time kernel
148s
max time network
142s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
07-09-2024 05:42

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General

Target

rti6787.exe
Size

741KB
MD5

0bc725a9a3a6bc0b8ed8da5713f6fbaa
SHA1

09ca298f60578c1a565d3c17773fc3f9bdb448bb
SHA256

b61fbbd592f750f0b85f955d69321b9eef03aa41e4bb8cc08562ff6f38ad38f0
SHA512

d5be08f18b27efb20e8789707ee81edcb6e1d81c6acd1a6bc28369d37b54dae9c573a5fdc3c0920a5e5436ff5309bd3bf890cfc8f5711d12bb24d3d645df9f88
SSDEEP

12288:3hY4wbycjZnwcy3Otc38OSNMt3QEXxaEbRu8MK+MjDpaOFx:3hY3WcjZPy3F8T6VbR3f+MjDEOFx

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Extracted

Family

djvu

http://zexeq.com/raud/get.php

Attributes

extension
.coza
offline_id
O8Ao46dcCReRPC4I1PGMYsRFFc9WI5eOp0O3MFt1
payload_url
http://colisumy.com/dl/build2.exe

http://zexeq.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. You can get and look video overview decrypt tool: https://we.tl/t-EPBZCVAS8s 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: 0693JOsie

rsa_pubkey.plain

Signatures

Detected Djvu ransomware 15 IoCs

resource	yara_rule
behavioral1/memory/2520-2-0x0000000004510000-0x000000000462B000-memory.dmp	family_djvu
behavioral1/memory/1800-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1800-8-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1800-9-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1800-15-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2900-19-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2900-34-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2900-33-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2900-43-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2900-49-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2900-60-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2900-63-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2900-61-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2900-64-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2900-65-0x0000000000400000-0x0000000000537000-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
2760	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-1-5-21-312935884-697965778-3955649944-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\d13ffd46-1873-48b9-b5f1-bdb3865ab5a1\\rti6787.exe\" --AutoStart"	rti6787.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
8	api.2ip.ua
9	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2520 set thread context of 1800	2520	rti6787.exe	30
PID 2692 set thread context of 2900	2692	rti6787.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	rti6787.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	icacls.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rti6787.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rti6787.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rti6787.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1800	rti6787.exe
1800	rti6787.exe
2900	rti6787.exe
2900	rti6787.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2520 wrote to memory of 1800	2520	rti6787.exe	30
PID 2520 wrote to memory of 1800	2520	rti6787.exe	30
PID 2520 wrote to memory of 1800	2520	rti6787.exe	30
PID 2520 wrote to memory of 1800	2520	rti6787.exe	30
PID 2520 wrote to memory of 1800	2520	rti6787.exe	30
PID 2520 wrote to memory of 1800	2520	rti6787.exe	30
PID 2520 wrote to memory of 1800	2520	rti6787.exe	30
PID 2520 wrote to memory of 1800	2520	rti6787.exe	30
PID 2520 wrote to memory of 1800	2520	rti6787.exe	30
PID 2520 wrote to memory of 1800	2520	rti6787.exe	30
PID 2520 wrote to memory of 1800	2520	rti6787.exe	30
PID 1800 wrote to memory of 2760	1800	rti6787.exe	33
PID 1800 wrote to memory of 2760	1800	rti6787.exe	33
PID 1800 wrote to memory of 2760	1800	rti6787.exe	33
PID 1800 wrote to memory of 2760	1800	rti6787.exe	33
PID 1800 wrote to memory of 2692	1800	rti6787.exe	34
PID 1800 wrote to memory of 2692	1800	rti6787.exe	34
PID 1800 wrote to memory of 2692	1800	rti6787.exe	34
PID 1800 wrote to memory of 2692	1800	rti6787.exe	34
PID 2692 wrote to memory of 2900	2692	rti6787.exe	35
PID 2692 wrote to memory of 2900	2692	rti6787.exe	35
PID 2692 wrote to memory of 2900	2692	rti6787.exe	35
PID 2692 wrote to memory of 2900	2692	rti6787.exe	35
PID 2692 wrote to memory of 2900	2692	rti6787.exe	35
PID 2692 wrote to memory of 2900	2692	rti6787.exe	35
PID 2692 wrote to memory of 2900	2692	rti6787.exe	35
PID 2692 wrote to memory of 2900	2692	rti6787.exe	35
PID 2692 wrote to memory of 2900	2692	rti6787.exe	35
PID 2692 wrote to memory of 2900	2692	rti6787.exe	35
PID 2692 wrote to memory of 2900	2692	rti6787.exe	35

C:\Users\Admin\AppData\Local\Temp\rti6787.exe
"C:\Users\Admin\AppData\Local\Temp\rti6787.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2520
- C:\Users\Admin\AppData\Local\Temp\rti6787.exe
  "C:\Users\Admin\AppData\Local\Temp\rti6787.exe"
  2⤵
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:1800
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\d13ffd46-1873-48b9-b5f1-bdb3865ab5a1" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    - System Location Discovery: System Language Discovery
    PID:2760
- - C:\Users\Admin\AppData\Local\Temp\rti6787.exe
    "C:\Users\Admin\AppData\Local\Temp\rti6787.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2692
  - - C:\Users\Admin\AppData\Local\Temp\rti6787.exe
      "C:\Users\Admin\AppData\Local\Temp\rti6787.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      PID:2900

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\Local\23985fe4-eaf6-4225-bfa7-37070207dc05\build3.exe

Filesize
437B

MD5
6910426a598bc0b07dd6ca7c2faf5c22

SHA1
4304d65a08652b167453997e1464cc6ef034be23

SHA256
ebfef207462c29030b8a06068c8cbf1cfeae1304813b9cdbfa2d705b314bf692

SHA512
5e96757fa5daa336968aa07d5fe5525040a081a547dd6bad55bed4539ad76b3f96aabd38f461efdafa4a427963b2a3187cc40dfa60c74e6c6ddf738176381952

Download Submit
C:\Users\Admin\AppData\Local\bowsakkdestx.txt

Filesize
449B

MD5
caa078f0348cda98328127c142e3bfed

SHA1
e38274d642c806a3affcca8f7e37b61f591c47e6

SHA256
91faeb982f34313750a83d74c5464abe4e01357d1a7ea4253973509bc0e9d219

SHA512
2e6a5c482b5226079c6b4bd9a706537c372a3b43962f64be6bdd281e3217f963316ef0eba38164890bdf14af6558eb26605320487f0a0c841be9bb813c2ee5d6

Download Submit
C:\Users\Admin\AppData\Local\d13ffd46-1873-48b9-b5f1-bdb3865ab5a1\rti6787.exe

Filesize
741KB

MD5
0bc725a9a3a6bc0b8ed8da5713f6fbaa

SHA1
09ca298f60578c1a565d3c17773fc3f9bdb448bb

SHA256
b61fbbd592f750f0b85f955d69321b9eef03aa41e4bb8cc08562ff6f38ad38f0

SHA512
d5be08f18b27efb20e8789707ee81edcb6e1d81c6acd1a6bc28369d37b54dae9c573a5fdc3c0920a5e5436ff5309bd3bf890cfc8f5711d12bb24d3d645df9f88

Download Submit
memory/1800-3-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1800-5-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1800-8-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1800-9-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1800-15-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2520-1-0x0000000000360000-0x00000000003F1000-memory.dmp

Filesize
580KB

Download
memory/2520-2-0x0000000004510000-0x000000000462B000-memory.dmp

Filesize
1.1MB

Download
memory/2520-7-0x0000000000360000-0x00000000003F1000-memory.dmp

Filesize
580KB

Download
memory/2520-0-0x0000000000360000-0x00000000003F1000-memory.dmp

Filesize
580KB

Download
memory/2692-16-0x00000000043C0000-0x0000000004451000-memory.dmp

Filesize
580KB

Download
memory/2900-33-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2900-34-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2900-43-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2900-49-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2900-19-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2900-60-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2900-63-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2900-61-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2900-64-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2900-65-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download