Analysis Overview
SHA256
81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc
Threat Level: Known bad
The file 81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc was found to be: Known bad.
Malicious Activity Summary
Detected Djvu ransomware
Djvu Ransomware
Modifies file permissions
Checks computer location settings
Adds Run key to start application
Looks up external IP address via web service
Suspicious use of SetThreadContext
Enumerates physical storage devices
Unsigned PE
Suspicious behavior: EnumeratesProcesses
Suspicious use of WriteProcessMemory
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-05-22 12:42
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral2
Detonation Overview
Submitted
2024-05-22 12:42
Reported
2024-05-22 12:45
Platform
win11-20240508-en
Max time kernel
143s
Max time network
127s
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-1-5-21-2457560273-69882387-977367775-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\f4cbe16c-8b55-4bc3-8992-3bc046a99c6d\\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe\" --AutoStart" | C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.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 3004 set thread context of 1804 | N/A | C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe | C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe |
| PID 5012 set thread context of 3488 | N/A | C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe | C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe |
Enumerates physical storage devices
Suspicious behavior: EnumeratesProcesses
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe
"C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe"
C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe
"C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe"
C:\Windows\SysWOW64\icacls.exe
icacls "C:\Users\Admin\AppData\Local\f4cbe16c-8b55-4bc3-8992-3bc046a99c6d" /deny *S-1-1-0:(OI)(CI)(DE,DC)
C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe
"C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe" --Admin IsNotAutoStart IsNotTask
C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe
"C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.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 | 67.169.217.172.in-addr.arpa | udp |
| US | 172.67.139.220:443 | api.2ip.ua | tcp |
| KR | 211.119.84.112:80 | sdfjhuz.com | tcp |
| MX | 187.134.55.166:80 | cajgtus.com | tcp |
| MX | 187.134.55.166:80 | cajgtus.com | tcp |
| US | 8.8.8.8:53 | 112.84.119.211.in-addr.arpa | udp |
| MX | 187.134.55.166:80 | cajgtus.com | tcp |
| MX | 187.134.55.166:80 | cajgtus.com | tcp |
| MX | 187.134.55.166:80 | cajgtus.com | tcp |
| US | 52.111.227.14:443 | tcp |
Files
memory/3004-1-0x0000000004A30000-0x0000000004ACB000-memory.dmp
memory/1804-3-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1804-4-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1804-5-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1804-6-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3004-2-0x0000000004B80000-0x0000000004C9B000-memory.dmp
C:\Users\Admin\AppData\Local\f4cbe16c-8b55-4bc3-8992-3bc046a99c6d\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe
| MD5 | 468a3f5c25350ab961951730de8c4ede |
| SHA1 | d8ff3e77681ab16fb0da2bf80bd1fd76aae75b7c |
| SHA256 | 81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc |
| SHA512 | 0ed8087d988a9b2f0ff3572e29b720890e24ccc1423c7f6d1260992197033018cc415c60d4f0d22c80c7d329b83daae0a27dc98d341e5563fef209a20b05f69d |
memory/1804-19-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3488-22-0x0000000000400000-0x0000000000537000-memory.dmp
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
| MD5 | 6728aea2631b86a76c237508d8ba9b55 |
| SHA1 | 7a670f95cac088313f7558869162fe01c6dc0ec9 |
| SHA256 | e1dd7380c6df33cd5702b032e0e359029d3ef7630f06ceb42cfdc154fd0baf7b |
| SHA512 | 533080cd1ec40b8530cad5c9914e0a5156d225f7392283ed2607eda4f1db4a6930002274060ed9130a6f634222c2e15818e16a50579cfe7f5274d028d31212f5 |
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
| MD5 | 7e6d5b8617fe039fca48abab0067a4f7 |
| SHA1 | 2eafde995b9010d8ddd19deae32d3f4278696efa |
| SHA256 | d7c4ba660fa0493a398ba170ee34569bb08a5009e3684b1bb069951ecc8f4889 |
| SHA512 | 82e6efcc1b70625c75237e51e72a99c33b98b964150e6f963eb00893ee2b30ef927dfd26b1b58df4d4ee40d3267ea26ee90c70b2525442dd69d56fed70437814 |
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
| MD5 | e55ff4b633b05f26589dbac13ad74182 |
| SHA1 | 3a9c12b2b00ebdf4f874aa70357441ad6dadf49d |
| SHA256 | a92cff4371b0d15d94a6e5a4e87bc3a8b4f1608a7db1569a35d2273c382d99a0 |
| SHA512 | aa092ddd39ebc80d972ac4c0b79ec289e4136b4c56da159adc526b1bc84341db8bda93f3a33e08ad327010ec768e11004edf8010e9f81b655d15af64aa5af17a |
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
| MD5 | 8202a1cd02e7d69597995cabbe881a12 |
| SHA1 | 8858d9d934b7aa9330ee73de6c476acf19929ff6 |
| SHA256 | 58f381c3a0a0ace6321da22e40bd44a597bd98b9c9390ab9258426b5cf75a7a5 |
| SHA512 | 97ba9fceab995d4bef706f8deef99e06862999734ebe6a05832c710104479c6337cbf0a76e1c1e0f91566a61334dc100d837dfd049e20da765fe49def684f9c9 |
memory/3488-27-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3488-28-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3488-29-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3488-34-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3488-32-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3488-35-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3488-36-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3488-37-0x0000000000400000-0x0000000000537000-memory.dmp
Analysis: behavioral1
Detonation Overview
Submitted
2024-05-22 12:42
Reported
2024-05-22 12:45
Platform
win10v2004-20240426-en
Max time kernel
146s
Max time network
130s
Command Line
Signatures
Detected Djvu ransomware
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
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Djvu Ransomware
Checks computer location settings
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\Control Panel\International\Geo\Nation | C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.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-1-5-21-4018855536-2201274732-320770143-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\18670b35-acb2-4ccb-98f4-118fee0d294b\\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe\" --AutoStart" | C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.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 932 set thread context of 4952 | N/A | C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe | C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe |
| PID 3368 set thread context of 1280 | N/A | C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe | C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe |
Enumerates physical storage devices
Suspicious behavior: EnumeratesProcesses
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe
"C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe"
C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe
"C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe"
C:\Windows\SysWOW64\icacls.exe
icacls "C:\Users\Admin\AppData\Local\18670b35-acb2-4ccb-98f4-118fee0d294b" /deny *S-1-1-0:(OI)(CI)(DE,DC)
C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe
"C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe" --Admin IsNotAutoStart IsNotTask
C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe
"C:\Users\Admin\AppData\Local\Temp\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe" --Admin IsNotAutoStart IsNotTask
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 97.17.167.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | api.2ip.ua | udp |
| US | 188.114.97.2:443 | api.2ip.ua | tcp |
| US | 8.8.8.8:53 | g.bing.com | udp |
| US | 204.79.197.237:443 | g.bing.com | tcp |
| US | 8.8.8.8:53 | 2.97.114.188.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 237.197.79.204.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 67.169.217.172.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 82.90.14.23.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 0.159.190.20.in-addr.arpa | udp |
| US | 188.114.97.2:443 | api.2ip.ua | tcp |
| US | 8.8.8.8:53 | sdfjhuz.com | udp |
| US | 8.8.8.8:53 | cajgtus.com | udp |
| KR | 211.119.84.112:80 | sdfjhuz.com | tcp |
| US | 8.8.8.8:53 | 112.84.119.211.in-addr.arpa | udp |
| CL | 190.13.174.94:80 | cajgtus.com | tcp |
| CL | 190.13.174.94:80 | cajgtus.com | tcp |
| NL | 23.62.61.72:443 | www.bing.com | tcp |
| US | 8.8.8.8:53 | 94.174.13.190.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 72.61.62.23.in-addr.arpa | udp |
| NL | 23.62.61.72:443 | www.bing.com | tcp |
| CL | 190.13.174.94:80 | cajgtus.com | tcp |
| US | 8.8.8.8:53 | 58.55.71.13.in-addr.arpa | udp |
| CL | 190.13.174.94:80 | cajgtus.com | tcp |
| CL | 190.13.174.94:80 | cajgtus.com | tcp |
| US | 8.8.8.8:53 | 26.165.165.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 206.23.85.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 172.210.232.199.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 43.58.199.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 48.229.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | tse1.mm.bing.net | udp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
Files
memory/932-1-0x0000000004840000-0x00000000048D5000-memory.dmp
memory/4952-3-0x0000000000400000-0x0000000000537000-memory.dmp
memory/932-4-0x0000000004A00000-0x0000000004B1B000-memory.dmp
memory/4952-2-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4952-5-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4952-6-0x0000000000400000-0x0000000000537000-memory.dmp
C:\Users\Admin\AppData\Local\18670b35-acb2-4ccb-98f4-118fee0d294b\81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc.exe
| MD5 | 468a3f5c25350ab961951730de8c4ede |
| SHA1 | d8ff3e77681ab16fb0da2bf80bd1fd76aae75b7c |
| SHA256 | 81fc7c9924ad00d3e9d0b8323673a8cd9298079040d2b69ad117f3253e99addc |
| SHA512 | 0ed8087d988a9b2f0ff3572e29b720890e24ccc1423c7f6d1260992197033018cc415c60d4f0d22c80c7d329b83daae0a27dc98d341e5563fef209a20b05f69d |
memory/4952-19-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1280-22-0x0000000000400000-0x0000000000537000-memory.dmp
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
| MD5 | 8202a1cd02e7d69597995cabbe881a12 |
| SHA1 | 8858d9d934b7aa9330ee73de6c476acf19929ff6 |
| SHA256 | 58f381c3a0a0ace6321da22e40bd44a597bd98b9c9390ab9258426b5cf75a7a5 |
| SHA512 | 97ba9fceab995d4bef706f8deef99e06862999734ebe6a05832c710104479c6337cbf0a76e1c1e0f91566a61334dc100d837dfd049e20da765fe49def684f9c9 |
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
| MD5 | 5d5bcba47f11c475f5a157fdf50300f3 |
| SHA1 | 4e64de416dfea4f909ccec5b565b4ea118ffb836 |
| SHA256 | 72929c83c7a6bfdbb8bbfe5a938257fb7f0b10a41309720c4ef0787252e97dab |
| SHA512 | 0b825bc576505c3ded5b4f8fe9e6ad4902b52026195de1fec07c805a4819fe43c10fd9f2b5ef900c9e9002113ae26c9ee5f964329f8d40af746bb5461d73fae8 |
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
| MD5 | 6728aea2631b86a76c237508d8ba9b55 |
| SHA1 | 7a670f95cac088313f7558869162fe01c6dc0ec9 |
| SHA256 | e1dd7380c6df33cd5702b032e0e359029d3ef7630f06ceb42cfdc154fd0baf7b |
| SHA512 | 533080cd1ec40b8530cad5c9914e0a5156d225f7392283ed2607eda4f1db4a6930002274060ed9130a6f634222c2e15818e16a50579cfe7f5274d028d31212f5 |
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
| MD5 | 616d3c6a010e479b2007212b8d9394d8 |
| SHA1 | 4ec157977440d9f6c459a5d57d0f7357407e4322 |
| SHA256 | 437174dbe4c037a1661fded7ca7e43569bd8e2b7a2d79965f6257868f6c7f38d |
| SHA512 | 207ef12842611a8f5a661269184712f0cc1c8320100ba0684b0b94e6f17f35f99ad077888b25d9dd061d2121e94c63e54ab14ecc1c566ba5def2ff1057dbf865 |
memory/1280-28-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1280-27-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1280-29-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1280-32-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1280-34-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1280-35-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1280-36-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1280-37-0x0000000000400000-0x0000000000537000-memory.dmp