djvu | 8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c

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

C2

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
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rsa_pubkey.plain

Signatures

Detected Djvu ransomware 15 IoCs

resource	yara_rule
behavioral2/memory/3280-2-0x00000000046F0000-0x000000000480B000-memory.dmp	family_djvu
behavioral2/memory/2452-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2452-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2452-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2452-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2452-20-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4152-22-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4152-27-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4152-28-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4152-29-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4152-32-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4152-35-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4152-34-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4152-36-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4152-38-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu

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

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1279544337-3716153908-718418795-1000\Control Panel\International\Geo\Nation	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
5524	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-1-5-21-1279544337-3716153908-718418795-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\fb3566e5-8ab4-4830-8493-0ede2133f102\\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
1	api.2ip.ua
2	api.2ip.ua
10	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3280 set thread context of 2452	3280	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	86
PID 3360 set thread context of 4152	3360	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	92

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	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.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	icacls.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2452	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe
2452	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe
4152	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe
4152	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 3280 wrote to memory of 2452	3280	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	86
PID 3280 wrote to memory of 2452	3280	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	86
PID 3280 wrote to memory of 2452	3280	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	86
PID 3280 wrote to memory of 2452	3280	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	86
PID 3280 wrote to memory of 2452	3280	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	86
PID 3280 wrote to memory of 2452	3280	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	86
PID 3280 wrote to memory of 2452	3280	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	86
PID 3280 wrote to memory of 2452	3280	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	86
PID 3280 wrote to memory of 2452	3280	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	86
PID 3280 wrote to memory of 2452	3280	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	86
PID 2452 wrote to memory of 5524	2452	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	89
PID 2452 wrote to memory of 5524	2452	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	89
PID 2452 wrote to memory of 5524	2452	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	89
PID 2452 wrote to memory of 3360	2452	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	90
PID 2452 wrote to memory of 3360	2452	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	90
PID 2452 wrote to memory of 3360	2452	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	90
PID 3360 wrote to memory of 4152	3360	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	92
PID 3360 wrote to memory of 4152	3360	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	92
PID 3360 wrote to memory of 4152	3360	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	92
PID 3360 wrote to memory of 4152	3360	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	92
PID 3360 wrote to memory of 4152	3360	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	92
PID 3360 wrote to memory of 4152	3360	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	92
PID 3360 wrote to memory of 4152	3360	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	92
PID 3360 wrote to memory of 4152	3360	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	92
PID 3360 wrote to memory of 4152	3360	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	92
PID 3360 wrote to memory of 4152	3360	8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe	92

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:3280
- C:\Users\Admin\AppData\Local\Temp\8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe
  "C:\Users\Admin\AppData\Local\Temp\8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe"
  2⤵
  - Checks computer location settings
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2452
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\fb3566e5-8ab4-4830-8493-0ede2133f102" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    - System Location Discovery: System Language Discovery
    PID:5524
- - 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:3360
  - - 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:4152

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

File and Directory Permissions Modification

Modify Registry

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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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
1920e5eb8073582a82dff496fd8c6499

SHA1
63c8b35276d6afca438f62c677cca3c488fa1ca6

SHA256
c21a5d0e819813de57557992b08b90326bad0fd38df5d0b7ab3fcff0dcb39b07

SHA512
aa7bdd1b7fa171a2bfa8708e8e4ec18870c83745dc8aa1ded1815fb967593b4cc7725e0871cecafb35547b8d38904e259e8867720dee8a84bea3b2b19c2c4c75

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

Filesize
170B

MD5
5d6b8bd91ec7368e86670fdc6ecda967

SHA1
e9c10cb1710c29c485b3907975b9978494e2e22d

SHA256
43acf230ea0bbab4f9cf5e6c48b451ebe1b1d195180e3131480f443b9c09298d

SHA512
58eb564b5d2b79c11259feb3d6325b4397ddeecaa72fd46151408858c75878a2657a0754f27757af5cb22d39de2e7eb7b14308ec629c3a88f5edd568ef345d14

Download Submit
C:\Users\Admin\AppData\Local\fb3566e5-8ab4-4830-8493-0ede2133f102\8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c.exe

Filesize
763KB

MD5
19f46c713419f534c1532645b764c7b4

SHA1
f61f07d60704ff3d843596a6068b12f565bbed23

SHA256
8b7851ae383ee5e1d106322f99d0a6149044e317ed310ce7464ff7d82afa725c

SHA512
595bad474662dd1e1cdbdec310c96b42201443d07c975a96c8d0bddb6f08714b55383aec213106424201be6304e7c620e696c54ee70ff8027c11f1cf129a08f4

Download Submit
memory/2452-6-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2452-4-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2452-20-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2452-3-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2452-5-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3280-2-0x00000000046F0000-0x000000000480B000-memory.dmp

Filesize
1.1MB

Download
memory/3280-1-0x0000000004650000-0x00000000046E9000-memory.dmp

Filesize
612KB

Download
memory/4152-22-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4152-27-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4152-28-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4152-29-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4152-32-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4152-35-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4152-34-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4152-36-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4152-38-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads