Analysis Overview
SHA256
f7561de520f21434830d40d74904e93125b76407d477411622bbd829283ba8c4
Threat Level: Known bad
The file 8f81e96f8c96dec003b51826bbd5885f.exe was found to be: Known bad.
Malicious Activity Summary
Djvu Ransomware
Detected Djvu ransomware
Checks computer location settings
Modifies file permissions
Adds Run key to start application
Looks up external IP address via web service
Suspicious use of SetThreadContext
Enumerates physical storage devices
Unsigned PE
System Location Discovery: System Language Discovery
Program crash
Suspicious use of WriteProcessMemory
Suspicious behavior: EnumeratesProcesses
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-08-13 19:58
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-08-13 19:58
Reported
2024-08-13 20:00
Platform
win7-20240708-en
Max time kernel
143s
Max time network
121s
Command Line
Signatures
Detected Djvu ransomware
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
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Djvu Ransomware
Modifies file permissions
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\icacls.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-3551809350-4263495960-1443967649-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\ba6b8eb4-cdd6-4fb6-924f-7f4ec85e9ffc\\8f81e96f8c96dec003b51826bbd5885f.exe\" --AutoStart" | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.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 |
Suspicious use of SetThreadContext
| Description | Indicator | Process | Target |
| PID 2432 set thread context of 2660 | N/A | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe |
| PID 2664 set thread context of 2564 | N/A | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe |
Enumerates physical storage devices
System Location Discovery: System Language Discovery
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.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\8f81e96f8c96dec003b51826bbd5885f.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe | N/A |
Suspicious behavior: EnumeratesProcesses
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe
"C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe"
C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe
"C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe"
C:\Windows\SysWOW64\icacls.exe
icacls "C:\Users\Admin\AppData\Local\ba6b8eb4-cdd6-4fb6-924f-7f4ec85e9ffc" /deny *S-1-1-0:(OI)(CI)(DE,DC)
C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe
"C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe" --Admin IsNotAutoStart IsNotTask
C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe
"C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe" --Admin IsNotAutoStart IsNotTask
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 |
| FR | 216.58.214.67:80 | c.pki.goog | tcp |
| US | 172.67.139.220:443 | api.2ip.ua | tcp |
| US | 8.8.8.8:53 | znpst.top | udp |
| US | 8.8.8.8:53 | securebiz.org | udp |
| DE | 92.246.89.93:80 | znpst.top | tcp |
| US | 8.8.8.8:53 | crl.microsoft.com | udp |
| GB | 173.222.211.58:80 | crl.microsoft.com | tcp |
Files
memory/2432-0-0x0000000000360000-0x00000000003F1000-memory.dmp
memory/2432-1-0x0000000000360000-0x00000000003F1000-memory.dmp
memory/2432-2-0x0000000000A90000-0x0000000000BAB000-memory.dmp
memory/2660-3-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
memory/2432-7-0x0000000000360000-0x00000000003F1000-memory.dmp
memory/2660-5-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2660-8-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2660-9-0x0000000000400000-0x0000000000537000-memory.dmp
C:\Users\Admin\AppData\Local\ba6b8eb4-cdd6-4fb6-924f-7f4ec85e9ffc\8f81e96f8c96dec003b51826bbd5885f.exe
| MD5 | 8f81e96f8c96dec003b51826bbd5885f |
| SHA1 | 7b8c4ec9a3808eaa32ab07d1608ad275f34adbe3 |
| SHA256 | f7561de520f21434830d40d74904e93125b76407d477411622bbd829283ba8c4 |
| SHA512 | 8770f01b013e401a3eef992aa53e7623a0367bf857309fa238781f70f44ef3e1e5697751d2a28b7ff1f35e8fad921b3fbfeb17f3c9724fab786934c8eb8ee8ce |
memory/2660-31-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2664-32-0x0000000000350000-0x00000000003E1000-memory.dmp
memory/2564-37-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2564-39-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2664-38-0x0000000000400000-0x00000000008ED000-memory.dmp
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 | 67b1ad782b206be953ed4411beeb2782 |
| SHA1 | 55ee376e1da92a6624dfbd51dd951a5309eff426 |
| SHA256 | ee4b8cba3218eae21aaee727733a64baabad38d29cc2f867751ba461fee787d3 |
| SHA512 | 526f600cb3ef1398e9b507db25763c43c466579a91554bd08adbb54e5fa9837b94bf14b2895952b9c8ff798b9b9e90ef4655d41593664cbc8bd6e2e616bc9e12 |
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B46811C17859FFB409CF0E904A4AA8F8
| MD5 | 85fb965aaac3425e25279a37ce5b992c |
| SHA1 | ac2b3a356e465421679d121b754fbdcef0a44e01 |
| SHA256 | 559b1b619bb3344363bbf2ab38bf7242c522ab707fd088060cbd912556feaace |
| SHA512 | 6f8fff33bb5f47917b693f74333c5a77178fb3b07da396479e12733182ca0971e624043f0fa9d337b5a13c178c035f792f35af5785254b6e29f442470b9a13db |
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\94308059B57B3142E455B38A6EB92015
| MD5 | b97a380ca83351242d55fea1d4b26c1b |
| SHA1 | b43219920c0be8a8dfaf7cc9e9a09948af43927a |
| SHA256 | 5f941c6dcc37a09c4b2ec09d04103cf293393cda2e2c824621919cb40311de5c |
| SHA512 | 83e7b9759c5abce2b02bbe80d1ff62709c8e9cd9b8b8abc656a9efd7e73410b0051f6de419862a9857379eddd307ae76154bfcef7d5d746e9032c678973191f6 |
C:\Users\Admin\AppData\Local\Temp\Cab57B1.tmp
| MD5 | 49aebf8cbd62d92ac215b2923fb1b9f5 |
| SHA1 | 1723be06719828dda65ad804298d0431f6aff976 |
| SHA256 | b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f |
| SHA512 | bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b |
memory/2564-54-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2564-55-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2564-56-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2564-58-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2564-60-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2564-62-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2564-63-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2564-64-0x0000000000400000-0x0000000000537000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-08-13 19:58
Reported
2024-08-13 20:00
Platform
win10v2004-20240802-en
Max time kernel
141s
Max time network
133s
Command Line
Signatures
Detected Djvu ransomware
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
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| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
Djvu Ransomware
Checks computer location settings
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\USER\S-1-5-21-2170637797-568393320-3232933035-1000\Control Panel\International\Geo\Nation | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe | N/A |
Modifies file permissions
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\icacls.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-2170637797-568393320-3232933035-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\ab173fe0-ed69-4e22-85ac-d5f2babfc50c\\8f81e96f8c96dec003b51826bbd5885f.exe\" --AutoStart" | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.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 |
Suspicious use of SetThreadContext
| Description | Indicator | Process | Target |
| PID 5024 set thread context of 3832 | N/A | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe |
| PID 4500 set thread context of 2840 | N/A | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe |
Enumerates physical storage devices
Program crash
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\WerFault.exe | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe |
System Location Discovery: System Language Discovery
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.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\8f81e96f8c96dec003b51826bbd5885f.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe | N/A |
Suspicious behavior: EnumeratesProcesses
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe
"C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe"
C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe
"C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe"
C:\Windows\SysWOW64\icacls.exe
icacls "C:\Users\Admin\AppData\Local\ab173fe0-ed69-4e22-85ac-d5f2babfc50c" /deny *S-1-1-0:(OI)(CI)(DE,DC)
C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe
"C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe" --Admin IsNotAutoStart IsNotTask
C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe
"C:\Users\Admin\AppData\Local\Temp\8f81e96f8c96dec003b51826bbd5885f.exe" --Admin IsNotAutoStart IsNotTask
C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2840 -ip 2840
C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2840 -s 568
C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=4336,i,16316361669272684588,6171287487746154806,262144 --variations-seed-version --mojo-platform-channel-handle=3776 /prefetch:8
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 8.8.8.8.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 217.106.137.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 22.58.20.217.in-addr.arpa | udp |
| 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 |
| NL | 142.250.179.131:80 | c.pki.goog | tcp |
| US | 8.8.8.8:53 | g.bing.com | udp |
| US | 13.107.21.237:443 | g.bing.com | tcp |
| US | 8.8.8.8:53 | 67.31.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 24.65.21.104.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 131.179.250.142.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 237.21.107.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 228.249.119.40.in-addr.arpa | 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 | 172.214.232.199.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 30.243.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 40.58.20.217.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 205.47.74.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | tse1.mm.bing.net | udp |
| US | 150.171.27.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.27.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.27.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.27.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.27.10:443 | tse1.mm.bing.net | tcp |
| US | 8.8.8.8:53 | 43.58.199.20.in-addr.arpa | udp |
Files
memory/5024-1-0x0000000000BA0000-0x0000000000C35000-memory.dmp
memory/5024-2-0x0000000000C60000-0x0000000000D7B000-memory.dmp
memory/3832-4-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3832-3-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3832-5-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3832-6-0x0000000000400000-0x0000000000537000-memory.dmp
C:\Users\Admin\AppData\Local\ab173fe0-ed69-4e22-85ac-d5f2babfc50c\8f81e96f8c96dec003b51826bbd5885f.exe
| MD5 | 8f81e96f8c96dec003b51826bbd5885f |
| SHA1 | 7b8c4ec9a3808eaa32ab07d1608ad275f34adbe3 |
| SHA256 | f7561de520f21434830d40d74904e93125b76407d477411622bbd829283ba8c4 |
| SHA512 | 8770f01b013e401a3eef992aa53e7623a0367bf857309fa238781f70f44ef3e1e5697751d2a28b7ff1f35e8fad921b3fbfeb17f3c9724fab786934c8eb8ee8ce |
memory/3832-19-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2840-22-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2840-25-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2840-24-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4500-27-0x0000000000400000-0x00000000008ED000-memory.dmp
memory/4500-26-0x0000000000400000-0x00000000008ED000-memory.dmp
memory/4500-30-0x0000000000400000-0x00000000008ED000-memory.dmp