Analysis
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max time kernel
145s -
max time network
146s -
platform
windows10-2004_x64 -
resource
win10v2004-20231222-en -
resource tags
arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system -
submitted
25/01/2024, 08:49
Static task
static1
Behavioral task
behavioral1
Sample
7441a4ce9c4e8ac5928eed31e78d925c.exe
Resource
win7-20231215-en
Behavioral task
behavioral2
Sample
7441a4ce9c4e8ac5928eed31e78d925c.exe
Resource
win10v2004-20231222-en
General
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Target
7441a4ce9c4e8ac5928eed31e78d925c.exe
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Size
783KB
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MD5
7441a4ce9c4e8ac5928eed31e78d925c
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SHA1
7cacc24fbfb677bfadd4685d5f7820a946a44448
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SHA256
3a245127ba06fa4a0106c4562138e0dafba141aa265795859ee000662e4ca470
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SHA512
bfe262ba1c33ad1d0f8a26e12621a89f7156c68ab2762c0a0b3359345510fd3583599e6750d0ca5b08f4c2627f2c659c4110f47e8095f2ebdd97d1ddab6e01df
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SSDEEP
24576:OKflY4gwkcHJwM2mpL6di/wQyZaTzUC/B:OEgwZwlmB6ClbnB
Malware Config
Extracted
djvu
http://astdg.top/fhsgtsspen6/get.php
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extension
.orkf
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offline_id
4aBXQVNZ4BhjpMjt78QLIFtBSJPbgbflYLHrBut1
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payload_url
http://securebiz.org/dl/build2.exe
http://astdg.top/files/1/build3.exe
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ransomnote
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Signatures
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Detected Djvu ransomware 21 IoCs
resource yara_rule behavioral2/memory/3216-2-0x00000000027E0000-0x00000000028FB000-memory.dmp family_djvu behavioral2/memory/3316-3-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/3316-4-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/3316-5-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/3316-6-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/3316-15-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/2088-20-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/2088-21-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/2088-22-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/2088-27-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/2088-28-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/2088-29-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/2088-31-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/2088-33-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/2088-34-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/2088-35-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/2088-37-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/1120-54-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/1120-55-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/1120-53-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/1120-56-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu -
Djvu Ransomware
Ransomware which is a variant of the STOP family.
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Renames multiple (182) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-1168293393-3419776239-306423207-1000\Control Panel\International\Geo\Nation 7441a4ce9c4e8ac5928eed31e78d925c.exe -
Executes dropped EXE 2 IoCs
pid Process 448 7441a4ce9c4e8ac5928eed31e78d925c.exe 1120 7441a4ce9c4e8ac5928eed31e78d925c.exe -
Modifies file permissions 1 TTPs 1 IoCs
pid Process 3572 icacls.exe -
Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-1168293393-3419776239-306423207-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\8ae8bc69-3b8a-47da-a3e9-81f1d5adf81a\\7441a4ce9c4e8ac5928eed31e78d925c.exe\" --AutoStart" 7441a4ce9c4e8ac5928eed31e78d925c.exe -
Looks up external IP address via web service 4 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
flow ioc 7 api.2ip.ua 21 api.2ip.ua 70 api.2ip.ua 6 api.2ip.ua -
Suspicious use of SetThreadContext 3 IoCs
description pid Process procid_target PID 3216 set thread context of 3316 3216 7441a4ce9c4e8ac5928eed31e78d925c.exe 88 PID 4868 set thread context of 2088 4868 7441a4ce9c4e8ac5928eed31e78d925c.exe 92 PID 448 set thread context of 1120 448 7441a4ce9c4e8ac5928eed31e78d925c.exe 102 -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Suspicious behavior: EnumeratesProcesses 8 IoCs
pid Process 3316 7441a4ce9c4e8ac5928eed31e78d925c.exe 3316 7441a4ce9c4e8ac5928eed31e78d925c.exe 2088 7441a4ce9c4e8ac5928eed31e78d925c.exe 2088 7441a4ce9c4e8ac5928eed31e78d925c.exe 1120 7441a4ce9c4e8ac5928eed31e78d925c.exe 1120 7441a4ce9c4e8ac5928eed31e78d925c.exe 2088 7441a4ce9c4e8ac5928eed31e78d925c.exe 2088 7441a4ce9c4e8ac5928eed31e78d925c.exe -
Suspicious use of WriteProcessMemory 36 IoCs
description pid Process procid_target PID 3216 wrote to memory of 3316 3216 7441a4ce9c4e8ac5928eed31e78d925c.exe 88 PID 3216 wrote to memory of 3316 3216 7441a4ce9c4e8ac5928eed31e78d925c.exe 88 PID 3216 wrote to memory of 3316 3216 7441a4ce9c4e8ac5928eed31e78d925c.exe 88 PID 3216 wrote to memory of 3316 3216 7441a4ce9c4e8ac5928eed31e78d925c.exe 88 PID 3216 wrote to memory of 3316 3216 7441a4ce9c4e8ac5928eed31e78d925c.exe 88 PID 3216 wrote to memory of 3316 3216 7441a4ce9c4e8ac5928eed31e78d925c.exe 88 PID 3216 wrote to memory of 3316 3216 7441a4ce9c4e8ac5928eed31e78d925c.exe 88 PID 3216 wrote to memory of 3316 3216 7441a4ce9c4e8ac5928eed31e78d925c.exe 88 PID 3216 wrote to memory of 3316 3216 7441a4ce9c4e8ac5928eed31e78d925c.exe 88 PID 3216 wrote to memory of 3316 3216 7441a4ce9c4e8ac5928eed31e78d925c.exe 88 PID 3316 wrote to memory of 3572 3316 7441a4ce9c4e8ac5928eed31e78d925c.exe 89 PID 3316 wrote to memory of 3572 3316 7441a4ce9c4e8ac5928eed31e78d925c.exe 89 PID 3316 wrote to memory of 3572 3316 7441a4ce9c4e8ac5928eed31e78d925c.exe 89 PID 3316 wrote to memory of 4868 3316 7441a4ce9c4e8ac5928eed31e78d925c.exe 90 PID 3316 wrote to memory of 4868 3316 7441a4ce9c4e8ac5928eed31e78d925c.exe 90 PID 3316 wrote to memory of 4868 3316 7441a4ce9c4e8ac5928eed31e78d925c.exe 90 PID 4868 wrote to memory of 2088 4868 7441a4ce9c4e8ac5928eed31e78d925c.exe 92 PID 4868 wrote to memory of 2088 4868 7441a4ce9c4e8ac5928eed31e78d925c.exe 92 PID 4868 wrote to memory of 2088 4868 7441a4ce9c4e8ac5928eed31e78d925c.exe 92 PID 4868 wrote to memory of 2088 4868 7441a4ce9c4e8ac5928eed31e78d925c.exe 92 PID 4868 wrote to memory of 2088 4868 7441a4ce9c4e8ac5928eed31e78d925c.exe 92 PID 4868 wrote to memory of 2088 4868 7441a4ce9c4e8ac5928eed31e78d925c.exe 92 PID 4868 wrote to memory of 2088 4868 7441a4ce9c4e8ac5928eed31e78d925c.exe 92 PID 4868 wrote to memory of 2088 4868 7441a4ce9c4e8ac5928eed31e78d925c.exe 92 PID 4868 wrote to memory of 2088 4868 7441a4ce9c4e8ac5928eed31e78d925c.exe 92 PID 4868 wrote to memory of 2088 4868 7441a4ce9c4e8ac5928eed31e78d925c.exe 92 PID 448 wrote to memory of 1120 448 7441a4ce9c4e8ac5928eed31e78d925c.exe 102 PID 448 wrote to memory of 1120 448 7441a4ce9c4e8ac5928eed31e78d925c.exe 102 PID 448 wrote to memory of 1120 448 7441a4ce9c4e8ac5928eed31e78d925c.exe 102 PID 448 wrote to memory of 1120 448 7441a4ce9c4e8ac5928eed31e78d925c.exe 102 PID 448 wrote to memory of 1120 448 7441a4ce9c4e8ac5928eed31e78d925c.exe 102 PID 448 wrote to memory of 1120 448 7441a4ce9c4e8ac5928eed31e78d925c.exe 102 PID 448 wrote to memory of 1120 448 7441a4ce9c4e8ac5928eed31e78d925c.exe 102 PID 448 wrote to memory of 1120 448 7441a4ce9c4e8ac5928eed31e78d925c.exe 102 PID 448 wrote to memory of 1120 448 7441a4ce9c4e8ac5928eed31e78d925c.exe 102 PID 448 wrote to memory of 1120 448 7441a4ce9c4e8ac5928eed31e78d925c.exe 102
Processes
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C:\Users\Admin\AppData\Local\Temp\7441a4ce9c4e8ac5928eed31e78d925c.exe"C:\Users\Admin\AppData\Local\Temp\7441a4ce9c4e8ac5928eed31e78d925c.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3216 -
C:\Users\Admin\AppData\Local\Temp\7441a4ce9c4e8ac5928eed31e78d925c.exe"C:\Users\Admin\AppData\Local\Temp\7441a4ce9c4e8ac5928eed31e78d925c.exe"2⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:3316 -
C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\8ae8bc69-3b8a-47da-a3e9-81f1d5adf81a" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
PID:3572
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C:\Users\Admin\AppData\Local\Temp\7441a4ce9c4e8ac5928eed31e78d925c.exe"C:\Users\Admin\AppData\Local\Temp\7441a4ce9c4e8ac5928eed31e78d925c.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4868 -
C:\Users\Admin\AppData\Local\Temp\7441a4ce9c4e8ac5928eed31e78d925c.exe"C:\Users\Admin\AppData\Local\Temp\7441a4ce9c4e8ac5928eed31e78d925c.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Suspicious behavior: EnumeratesProcesses
PID:2088
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C:\Users\Admin\AppData\Local\8ae8bc69-3b8a-47da-a3e9-81f1d5adf81a\7441a4ce9c4e8ac5928eed31e78d925c.exeC:\Users\Admin\AppData\Local\8ae8bc69-3b8a-47da-a3e9-81f1d5adf81a\7441a4ce9c4e8ac5928eed31e78d925c.exe --Task1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:448 -
C:\Users\Admin\AppData\Local\8ae8bc69-3b8a-47da-a3e9-81f1d5adf81a\7441a4ce9c4e8ac5928eed31e78d925c.exeC:\Users\Admin\AppData\Local\8ae8bc69-3b8a-47da-a3e9-81f1d5adf81a\7441a4ce9c4e8ac5928eed31e78d925c.exe --Task2⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:1120
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
Filesize1KB
MD5819d2f6d228f94bfebac03edbfa4bc64
SHA1257acbdf2270c5285962d10460a77f422143cc8d
SHA256e8b016b694a9c3224b6a405cf52010c03b7bc6c8948ecc8a3d9aaa39a18f6d47
SHA512b81c03ca94d21cdb106281fa478dccd390e07bd0a03d0077952041f3d1d41a671ac9a3d4c97d41d9c8f74b14214abfcaff696a10d0615b603a7a9b1a67adde67
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
Filesize724B
MD58202a1cd02e7d69597995cabbe881a12
SHA18858d9d934b7aa9330ee73de6c476acf19929ff6
SHA25658f381c3a0a0ace6321da22e40bd44a597bd98b9c9390ab9258426b5cf75a7a5
SHA51297ba9fceab995d4bef706f8deef99e06862999734ebe6a05832c710104479c6337cbf0a76e1c1e0f91566a61334dc100d837dfd049e20da765fe49def684f9c9
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
Filesize410B
MD5a8f57f9fc60e110005c59da12cc933d8
SHA136ebdd4a5b771c3b146573bc8ececd3b1cc2675b
SHA2561b14bf746e2b2b854de0b9da31ddd652a3058c39f0a3251c1608db80f660d049
SHA5129d36bdf382665f90804c033bc5fc7af8b5aced57f7d3f795d15d205eb7353c03d46fa04cc1b426087cece19048294140f6a6f3d566b8605bada8c66fed9b0094
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
Filesize392B
MD502f35a2d8cd3130c3be18c2eb00e1fe1
SHA1dce0dc82612d7234f8a9c2e2828ddb96afb5d7f5
SHA256c086f01ecb771beb99b1bf146b82a31072af688c9d77977a474d32e0af27eb5a
SHA5123bf51e9baca9aeb05bc8b418c5bdb4da457946a18093de2795b7b6a9b16a0f654169c15733f32337afc68cb650a3df1c81f1a0a043ef0234c1416f4fd570426b
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C:\Users\Admin\AppData\Local\8ae8bc69-3b8a-47da-a3e9-81f1d5adf81a\7441a4ce9c4e8ac5928eed31e78d925c.exe
Filesize783KB
MD57441a4ce9c4e8ac5928eed31e78d925c
SHA17cacc24fbfb677bfadd4685d5f7820a946a44448
SHA2563a245127ba06fa4a0106c4562138e0dafba141aa265795859ee000662e4ca470
SHA512bfe262ba1c33ad1d0f8a26e12621a89f7156c68ab2762c0a0b3359345510fd3583599e6750d0ca5b08f4c2627f2c659c4110f47e8095f2ebdd97d1ddab6e01df
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C:\Users\Admin\AppData\Local\8ae8bc69-3b8a-47da-a3e9-81f1d5adf81a\7441a4ce9c4e8ac5928eed31e78d925c.exe
Filesize64KB
MD55f54ad291e321fd454c783216afa317e
SHA199fbe4daf4b97636fd388ed0921acbc33f06b4bb
SHA25629d85dede6f20a7a142514b1b2084cbfe96b8de07df3486004388871b9ef1e50
SHA512d6a8adf2da60b42f70b6c82b483e153ec383617e685f68d0df09aa0546355fd205991bba679de2ac2431856eddee6cf578409eef5cf554e511084b7e93a868d5