Malware Analysis Report

2024-10-23 16:21

Sample ID 240904-ebp5cavalm
Target 2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop
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 2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop was found to be: Known bad.

Malicious Activity Summary

djvu discovery persistence ransomware

Detected Djvu ransomware

Djvu Ransomware

Djvu family

Checks computer location settings

Executes dropped EXE

Modifies file permissions

Adds Run key to start application

Looks up external IP address via web service

Unsigned PE

System Location Discovery: System Language Discovery

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-09-04 03:46

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 03:46

Reported

2024-09-04 03:48

Platform

win7-20240729-en

Max time kernel

143s

Max time network

145s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.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-1-5-21-2703099537-420551529-3771253338-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\0fccf1fe-7ff7-4834-b342-5859158bc247\\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe\" --AutoStart" C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.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\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.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\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\0fccf1fe-7ff7-4834-b342-5859158bc247\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2716 wrote to memory of 2812 N/A C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe C:\Windows\SysWOW64\icacls.exe
PID 2716 wrote to memory of 2812 N/A C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe C:\Windows\SysWOW64\icacls.exe
PID 2716 wrote to memory of 2812 N/A C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe C:\Windows\SysWOW64\icacls.exe
PID 2716 wrote to memory of 2812 N/A C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe C:\Windows\SysWOW64\icacls.exe
PID 2716 wrote to memory of 2164 N/A C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe
PID 2716 wrote to memory of 2164 N/A C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe
PID 2716 wrote to memory of 2164 N/A C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe
PID 2716 wrote to memory of 2164 N/A C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe
PID 2084 wrote to memory of 1724 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Local\0fccf1fe-7ff7-4834-b342-5859158bc247\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe
PID 2084 wrote to memory of 1724 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Local\0fccf1fe-7ff7-4834-b342-5859158bc247\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe
PID 2084 wrote to memory of 1724 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Local\0fccf1fe-7ff7-4834-b342-5859158bc247\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe
PID 2084 wrote to memory of 1724 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Local\0fccf1fe-7ff7-4834-b342-5859158bc247\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe

Processes

C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe

"C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe"

C:\Windows\SysWOW64\icacls.exe

icacls "C:\Users\Admin\AppData\Local\0fccf1fe-7ff7-4834-b342-5859158bc247" /deny *S-1-1-0:(OI)(CI)(DE,DC)

C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe

"C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe" --Admin IsNotAutoStart IsNotTask

C:\Windows\system32\taskeng.exe

taskeng.exe {AA69A64B-C6AC-473E-9FB8-12321A329E32} S-1-5-21-2703099537-420551529-3771253338-1000:XECUDNCD\Admin:Interactive:[1]

C:\Users\Admin\AppData\Local\0fccf1fe-7ff7-4834-b342-5859158bc247\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe

C:\Users\Admin\AppData\Local\0fccf1fe-7ff7-4834-b342-5859158bc247\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe --Task

Network

Country Destination Domain Proto
US 8.8.8.8:53 api.2ip.ua udp
US 104.21.65.24:443 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 104.21.65.24:443 api.2ip.ua tcp
US 8.8.8.8:53 vrta.top udp
US 8.8.8.8:53 www.microsoft.com udp
GB 95.100.245.144:80 www.microsoft.com tcp
US 104.21.65.24:443 api.2ip.ua tcp
US 8.8.8.8:53 www.microsoft.com udp

Files

C:\Users\Admin\AppData\Local\0fccf1fe-7ff7-4834-b342-5859158bc247\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe

MD5 591b5afb1f701910bb6b2a95e83b9f15
SHA1 f3c0a74e0c38e75ec86195c83244831ae21cde58
SHA256 25fee0d9c2bf841ad0c0271a34e450d2a82dcc91d6fd7c669b9882fc436e06ea
SHA512 a66af28164683d16522e4c2a446ccaf1c9f64cbd743747c25359a2dc31e011683c1e852a829361ec61b9cdd7479114823fb684e28c7fa8754fd173f3c9b1f4ea

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 38abad8036e71ed42d84870b2e4bd4a0
SHA1 b91e1c0f4214bedff0ac31f94290ce90c91e5537
SHA256 1d94765d6f9417f5f69b9ebb8a16628b5778259a93ee017d039cb10af5cdae7f
SHA512 11f5c204baf4154f3b945f947996ee6b437d3195ca52852127ceaa175a28cee9b49e62e35011c8bc631f495222791a61c1e4ae5a73d9e847d6978fcbbe024775

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 d0aca34d6b1193cc9fc178f329f9e47c
SHA1 08e10159b2fb45ee73ba1c49c81c27c75627f3e8
SHA256 036559b9513f0b05daba304895b91e13dde083ca719f8f23a945fd46728a45ef
SHA512 e06991dd9919c56875a56dc2ccdd6f7151817a0719277db402fd8c669841f5918749b5d8151336fbd25dc3d490565ccf0c0db9b9682857134915e6f3a05ffff2

C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015

MD5 dc7d1c37e6f5e410d648a34a9ed64c49
SHA1 adcad5fc01c17e6a71c3a1bbae58f476f913b382
SHA256 d48e2e7a5fbf2335b5f379c6553b4ec73302df8389b6c4f1b29d251e97958935
SHA512 9588add20c5bfec3349df23436d09e60c420d571280a0a83925574231192d52d59f9a9f0cce3d4170a5cfef9e89c4c0bfaeba118e1db7121b48470f5f367c95a

C:\Users\Admin\AppData\Local\Temp\Cab2A7A.tmp

MD5 49aebf8cbd62d92ac215b2923fb1b9f5
SHA1 1723be06719828dda65ad804298d0431f6aff976
SHA256 b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f
SHA512 bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

C:\Users\Admin\AppData\Local\Temp\Tar5504.tmp

MD5 4ea6026cf93ec6338144661bf1202cd1
SHA1 a1dec9044f750ad887935a01430bf49322fbdcb7
SHA256 8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8
SHA512 6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

Analysis: behavioral2

Detonation Overview

Submitted

2024-09-04 03:46

Reported

2024-09-04 03:48

Platform

win10v2004-20240802-en

Max time kernel

143s

Max time network

144s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.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-1-5-21-2718105630-359604950-2820636825-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.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-1-5-21-2718105630-359604950-2820636825-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\4d899bc8-cc10-43f3-8527-8f72f76eca21\\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe\" --AutoStart" C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.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\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.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\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\4d899bc8-cc10-43f3-8527-8f72f76eca21\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe

"C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe"

C:\Windows\SysWOW64\icacls.exe

icacls "C:\Users\Admin\AppData\Local\4d899bc8-cc10-43f3-8527-8f72f76eca21" /deny *S-1-1-0:(OI)(CI)(DE,DC)

C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe

"C:\Users\Admin\AppData\Local\Temp\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe" --Admin IsNotAutoStart IsNotTask

C:\Users\Admin\AppData\Local\4d899bc8-cc10-43f3-8527-8f72f76eca21\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe

C:\Users\Admin\AppData\Local\4d899bc8-cc10-43f3-8527-8f72f76eca21\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.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 58.55.71.13.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 81.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 99.201.58.216.in-addr.arpa udp
US 8.8.8.8:53 71.31.126.40.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 vrta.top udp
US 8.8.8.8:53 232.168.11.51.in-addr.arpa udp
US 8.8.8.8:53 vrta.top udp
US 8.8.8.8:53 vrta.top udp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 65.139.73.23.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 30.243.111.52.in-addr.arpa udp
US 172.67.139.220:443 api.2ip.ua tcp

Files

C:\Users\Admin\AppData\Local\4d899bc8-cc10-43f3-8527-8f72f76eca21\2024-09-04_591b5afb1f701910bb6b2a95e83b9f15_stop.exe

MD5 591b5afb1f701910bb6b2a95e83b9f15
SHA1 f3c0a74e0c38e75ec86195c83244831ae21cde58
SHA256 25fee0d9c2bf841ad0c0271a34e450d2a82dcc91d6fd7c669b9882fc436e06ea
SHA512 a66af28164683d16522e4c2a446ccaf1c9f64cbd743747c25359a2dc31e011683c1e852a829361ec61b9cdd7479114823fb684e28c7fa8754fd173f3c9b1f4ea

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

MD5 cd5e54c2dc03872f26017df0bbd69b34
SHA1 ea95e80df7047b31414738f20a144f4382706014
SHA256 fb7399f57f0bd4c6edb725a5ad33994ddf6c8a77f6b0bd420637fc0772271f59
SHA512 116d3c1f0580df3ec2c31e9f90a111b052b629db6168a46b535787240103da5cd1904c608510bdd79962297f88341b89448c102510828c7085f2817932b82dce

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 6e4d5db4870b7ee13728002756519842
SHA1 c04560efef518d6141b06a6227869d099dba2e87
SHA256 c05782e5f4389aefc89dbed53bf093fd72b14bd046e7271afcc0653a7b3823b7
SHA512 cedc9d3fd6a323ab23d786c96fc90c98aec460e90291271f61fb80873c39e52de1194c218101db3af873db6ad278348aa0f85e8b9b91a3b3c4f9f6d481166d7b

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

MD5 971c514f84bba0785f80aa1c23edfd79
SHA1 732acea710a87530c6b08ecdf32a110d254a54c8
SHA256 f157ed17fcaf8837fa82f8b69973848c9b10a02636848f995698212a08f31895
SHA512 43dc1425d80e170c645a3e3bb56da8c3acd31bd637329e9e37094ac346ac85434df4edcdbefc05ae00aea33a80a88e2af695997a495611217fe6706075a63c58