Malware Analysis Report

2024-10-23 16:21

Sample ID 240904-gyb74svhnj
Target 20240904591b5afb1f701910bb6b2a95e83b9f15stop
SHA256 25fee0d9c2bf841ad0c0271a34e450d2a82dcc91d6fd7c669b9882fc436e06ea
Tags
djvu discovery persistence ransomware
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

25fee0d9c2bf841ad0c0271a34e450d2a82dcc91d6fd7c669b9882fc436e06ea

Threat Level: Known bad

The file 20240904591b5afb1f701910bb6b2a95e83b9f15stop was found to be: Known bad.

Malicious Activity Summary

djvu discovery persistence ransomware

Djvu family

Djvu Ransomware

Detected Djvu ransomware

Checks computer location settings

Executes dropped EXE

Modifies file permissions

Looks up external IP address via web service

Adds Run key to start application

System Location Discovery: System Language Discovery

Unsigned PE

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-09-04 06:12

Signatures

Detected Djvu ransomware

Description Indicator Process Target
N/A N/A N/A N/A

Djvu family

djvu

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-09-04 06:12

Reported

2024-09-04 06:15

Platform

win7-20240903-en

Max time kernel

146s

Max time network

154s

Command Line

"C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe"

Signatures

Detected Djvu ransomware

Description Indicator Process Target
N/A N/A N/A N/A

Djvu Ransomware

ransomware djvu

Modifies file permissions

discovery
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\icacls.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-4177215427-74451935-3209572229-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\ca13dd84-59ad-4706-a060-b82d1a0333ef\\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe\" --AutoStart" C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe N/A

Looks up external IP address via web service

Description Indicator Process Target
N/A api.2ip.ua N/A N/A
N/A api.2ip.ua N/A N/A
N/A api.2ip.ua N/A N/A
N/A api.2ip.ua N/A N/A

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\ca13dd84-59ad-4706-a060-b82d1a0333ef\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\icacls.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3036 wrote to memory of 2868 N/A C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe C:\Windows\SysWOW64\icacls.exe
PID 3036 wrote to memory of 2868 N/A C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe C:\Windows\SysWOW64\icacls.exe
PID 3036 wrote to memory of 2868 N/A C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe C:\Windows\SysWOW64\icacls.exe
PID 3036 wrote to memory of 2868 N/A C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe C:\Windows\SysWOW64\icacls.exe
PID 3036 wrote to memory of 2828 N/A C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe
PID 3036 wrote to memory of 2828 N/A C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe
PID 3036 wrote to memory of 2828 N/A C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe
PID 3036 wrote to memory of 2828 N/A C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe
PID 1540 wrote to memory of 2064 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Local\ca13dd84-59ad-4706-a060-b82d1a0333ef\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe
PID 1540 wrote to memory of 2064 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Local\ca13dd84-59ad-4706-a060-b82d1a0333ef\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe
PID 1540 wrote to memory of 2064 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Local\ca13dd84-59ad-4706-a060-b82d1a0333ef\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe
PID 1540 wrote to memory of 2064 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Local\ca13dd84-59ad-4706-a060-b82d1a0333ef\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe

Processes

C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe

"C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe"

C:\Windows\SysWOW64\icacls.exe

icacls "C:\Users\Admin\AppData\Local\ca13dd84-59ad-4706-a060-b82d1a0333ef" /deny *S-1-1-0:(OI)(CI)(DE,DC)

C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe

"C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe" --Admin IsNotAutoStart IsNotTask

C:\Windows\system32\taskeng.exe

taskeng.exe {08E5FAF9-4592-43E6-B608-EB1304AFAFE3} S-1-5-21-4177215427-74451935-3209572229-1000:JSMURNPT\Admin:Interactive:[1]

C:\Users\Admin\AppData\Local\ca13dd84-59ad-4706-a060-b82d1a0333ef\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe

C:\Users\Admin\AppData\Local\ca13dd84-59ad-4706-a060-b82d1a0333ef\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe --Task

Network

Country Destination Domain Proto
US 8.8.8.8:53 api.2ip.ua udp
US 172.67.139.220:443 api.2ip.ua tcp
US 8.8.8.8:53 c.pki.goog udp
GB 216.58.201.99:80 c.pki.goog tcp
US 172.67.139.220:443 api.2ip.ua tcp
US 8.8.8.8:53 vrta.top udp
US 172.67.139.220:443 api.2ip.ua tcp

Files

C:\Users\Admin\AppData\Local\ca13dd84-59ad-4706-a060-b82d1a0333ef\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe

MD5 591b5afb1f701910bb6b2a95e83b9f15
SHA1 f3c0a74e0c38e75ec86195c83244831ae21cde58
SHA256 25fee0d9c2bf841ad0c0271a34e450d2a82dcc91d6fd7c669b9882fc436e06ea
SHA512 a66af28164683d16522e4c2a446ccaf1c9f64cbd743747c25359a2dc31e011683c1e852a829361ec61b9cdd7479114823fb684e28c7fa8754fd173f3c9b1f4ea

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

MD5 971c514f84bba0785f80aa1c23edfd79
SHA1 732acea710a87530c6b08ecdf32a110d254a54c8
SHA256 f157ed17fcaf8837fa82f8b69973848c9b10a02636848f995698212a08f31895
SHA512 43dc1425d80e170c645a3e3bb56da8c3acd31bd637329e9e37094ac346ac85434df4edcdbefc05ae00aea33a80a88e2af695997a495611217fe6706075a63c58

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

MD5 eba0e2275c706dc562613f896fbc5120
SHA1 7380bbfdd7a7299e54c915ca6ba024c682c98f59
SHA256 8623b6d90c16086b4aba6fd35eee90a4688fb8e62453139726df6d27d9be2a5b
SHA512 aa85289c10c018f91687d84f4968db983ec51f0548b828ad69c0b0b59bb258185441aaeec17bfee0df01a59c229233c61967a32542e5fad945d9a2c8f0bb0e2a

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

MD5 7fb5fa1534dcf77f2125b2403b30a0ee
SHA1 365d96812a69ac0a4611ea4b70a3f306576cc3ea
SHA256 33a39e9ec2133230533a686ec43760026e014a3828c703707acbc150fe40fd6f
SHA512 a9279fd60505a1bfeef6fb07834cad0fd5be02fd405573fc1a5f59b991e9f88f5e81c32fe910f69bdc6585e71f02559895149eaf49c25b8ff955459fd60c0d2e

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

MD5 091c278e9aeba650118d651f0916f968
SHA1 9a999ec21900c6bfea9624bba7e16630f4df03be
SHA256 0697a7157e33c0659f62a97177ed2411f27859b9189f8b758bd9f1455fd01784
SHA512 2b4910f9f0b6565205516c283715bc3a68ed87b3f3413925550c05011d0ff7c6169b5a8d8a9045aef7932179fcd6cbf12322468348bfeacb99daee350810c3f0

C:\Users\Admin\AppData\Local\Temp\CabCEC4.tmp

MD5 49aebf8cbd62d92ac215b2923fb1b9f5
SHA1 1723be06719828dda65ad804298d0431f6aff976
SHA256 b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f
SHA512 bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

C:\Users\Admin\AppData\Local\Temp\TarF873.tmp

MD5 4ea6026cf93ec6338144661bf1202cd1
SHA1 a1dec9044f750ad887935a01430bf49322fbdcb7
SHA256 8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8
SHA512 6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

Analysis: behavioral2

Detonation Overview

Submitted

2024-09-04 06:12

Reported

2024-09-04 06:15

Platform

win10v2004-20240802-en

Max time kernel

145s

Max time network

156s

Command Line

"C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe"

Signatures

Detected Djvu ransomware

Description Indicator Process Target
N/A N/A N/A N/A

Djvu Ransomware

ransomware djvu

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-2412658365-3084825385-3340777666-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe N/A

Modifies file permissions

discovery
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\icacls.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-2412658365-3084825385-3340777666-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\7a75336b-dddc-43dc-9859-55780a4438b0\\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe\" --AutoStart" C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe N/A

Looks up external IP address via web service

Description Indicator Process Target
N/A api.2ip.ua N/A N/A
N/A api.2ip.ua N/A N/A
N/A api.2ip.ua N/A N/A
N/A api.2ip.ua N/A N/A

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\icacls.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\7a75336b-dddc-43dc-9859-55780a4438b0\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe

"C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe"

C:\Windows\SysWOW64\icacls.exe

icacls "C:\Users\Admin\AppData\Local\7a75336b-dddc-43dc-9859-55780a4438b0" /deny *S-1-1-0:(OI)(CI)(DE,DC)

C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe

"C:\Users\Admin\AppData\Local\Temp\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe" --Admin IsNotAutoStart IsNotTask

C:\Users\Admin\AppData\Local\7a75336b-dddc-43dc-9859-55780a4438b0\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe

C:\Users\Admin\AppData\Local\7a75336b-dddc-43dc-9859-55780a4438b0\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe --Task

Network

Country Destination Domain Proto
US 8.8.8.8:53 api.2ip.ua udp
US 172.67.139.220:443 api.2ip.ua tcp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 c.pki.goog udp
GB 216.58.201.99:80 c.pki.goog tcp
US 8.8.8.8:53 220.139.67.172.in-addr.arpa udp
US 8.8.8.8:53 99.201.58.216.in-addr.arpa udp
US 8.8.8.8:53 64.159.190.20.in-addr.arpa udp
US 172.67.139.220:443 api.2ip.ua tcp
US 8.8.8.8:53 vrta.top udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 vrta.top udp
US 8.8.8.8:53 104.219.191.52.in-addr.arpa udp
US 8.8.8.8:53 vrta.top udp
US 8.8.8.8:53 vrta.top udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 14.227.111.52.in-addr.arpa udp
US 172.67.139.220:443 api.2ip.ua tcp

Files

C:\Users\Admin\AppData\Local\7a75336b-dddc-43dc-9859-55780a4438b0\20240904591b5afb1f701910bb6b2a95e83b9f15stop.exe

MD5 591b5afb1f701910bb6b2a95e83b9f15
SHA1 f3c0a74e0c38e75ec86195c83244831ae21cde58
SHA256 25fee0d9c2bf841ad0c0271a34e450d2a82dcc91d6fd7c669b9882fc436e06ea
SHA512 a66af28164683d16522e4c2a446ccaf1c9f64cbd743747c25359a2dc31e011683c1e852a829361ec61b9cdd7479114823fb684e28c7fa8754fd173f3c9b1f4ea

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

MD5 52f5c6ea10b226052c65e97285144c77
SHA1 3339fbfa8f645290b23cf9e0f6b8bd5b180deec7
SHA256 8d3390b1fda91eec75f121a3bfbe334290655ab0862ad4a79a26e3313317e0c5
SHA512 270d60265783f91a6462f87141b30e53046fce3f99928589c06371e3d02a14ae53e5bf3b8c8ccfa6306566f57419c761f14a0248aacb10f46a9b6017ace5712d

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

MD5 971c514f84bba0785f80aa1c23edfd79
SHA1 732acea710a87530c6b08ecdf32a110d254a54c8
SHA256 f157ed17fcaf8837fa82f8b69973848c9b10a02636848f995698212a08f31895
SHA512 43dc1425d80e170c645a3e3bb56da8c3acd31bd637329e9e37094ac346ac85434df4edcdbefc05ae00aea33a80a88e2af695997a495611217fe6706075a63c58

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

MD5 7fb5fa1534dcf77f2125b2403b30a0ee
SHA1 365d96812a69ac0a4611ea4b70a3f306576cc3ea
SHA256 33a39e9ec2133230533a686ec43760026e014a3828c703707acbc150fe40fd6f
SHA512 a9279fd60505a1bfeef6fb07834cad0fd5be02fd405573fc1a5f59b991e9f88f5e81c32fe910f69bdc6585e71f02559895149eaf49c25b8ff955459fd60c0d2e

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

MD5 001ce6a069f47780f3d91c6871e78a30
SHA1 d480ba721e1f34a7cda94244d1fdaedc9c191e66
SHA256 e17d5478d5d3c7e74acdc1c8171a5a9744b94a7201196550cdb0cb59da789c73
SHA512 39ad728fb60d64922b5642b4493991554bb1948001a429fb5de90ca1fa58320a5ac79f05b0267e1db1ab69bfde2d1d005f2c58215205c7e6720c93f6e3a65767