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Analysis
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max time kernel
70s -
max time network
147s -
platform
windows10-1703_x64 -
resource
win10-20220901-en -
resource tags
arch:x64arch:x86image:win10-20220901-enlocale:en-usos:windows10-1703-x64system -
submitted
10/10/2022, 06:45
Static task
static1
Behavioral task
behavioral1
Sample
783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe
Resource
win10-20220901-en
General
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Target
783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe
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Size
790KB
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MD5
d22496b92fa86f2233003edfe5b83fd1
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SHA1
c3b395a05b9f9dd69acf6662a410e3a0865c1df5
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SHA256
783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813
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SHA512
20571f3bfcf1ca7f445890c4834c4c2339c3ee56530fc9926c53cd9c7aec8237a7a43a5ad44ce6ec12663ea167f1e6c02ca29304b2dfc71ebe797b654e17333f
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SSDEEP
12288:82krEHjGP9tyBK4hVX3ZSjc7qN1H1fd1avknRicLiQVF5cpAd:82krEHDBK4jJS1Nh1fXRiEiQV0pA
Malware Config
Extracted
djvu
http://winnlinne.com/lancer/get.php
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extension
.towz
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offline_id
SSHsHMHGmSIhrz50VnIxLJJX15osxEQY6iXedXt1
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payload_url
http://rgyui.top/dl/build2.exe
http://winnlinne.com/files/1/build3.exe
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ransomnote
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Signatures
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Detected Djvu ransomware 9 IoCs
resource yara_rule behavioral1/memory/4944-147-0x0000000002380000-0x000000000249B000-memory.dmp family_djvu behavioral1/memory/1004-151-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/1004-152-0x0000000000424141-mapping.dmp family_djvu behavioral1/memory/1004-158-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/1004-219-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/1004-252-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4992-279-0x0000000000424141-mapping.dmp family_djvu behavioral1/memory/4992-353-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4992-425-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu -
Djvu Ransomware
Ransomware which is a variant of the STOP family.
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Downloads MZ/PE file
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Executes dropped EXE 2 IoCs
pid Process 4712 build3.exe 4756 mstsca.exe -
Modifies file permissions 1 TTPs 1 IoCs
pid Process 2760 icacls.exe -
Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-2368682536-4045190062-1465778271-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\4251ab14-0782-4d39-b304-f9f99e2a2e5f\\783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe\" --AutoStart" 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe -
Looks up external IP address via web service 3 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
flow ioc 10 api.2ip.ua 2 api.2ip.ua 3 api.2ip.ua -
Suspicious use of SetThreadContext 2 IoCs
description pid Process procid_target PID 4944 set thread context of 1004 4944 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 66 PID 4572 set thread context of 4992 4572 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 70 -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 340 schtasks.exe 444 schtasks.exe -
Suspicious behavior: EnumeratesProcesses 4 IoCs
pid Process 1004 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 1004 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 4992 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 4992 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe -
Suspicious use of WriteProcessMemory 35 IoCs
description pid Process procid_target PID 4944 wrote to memory of 1004 4944 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 66 PID 4944 wrote to memory of 1004 4944 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 66 PID 4944 wrote to memory of 1004 4944 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 66 PID 4944 wrote to memory of 1004 4944 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 66 PID 4944 wrote to memory of 1004 4944 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 66 PID 4944 wrote to memory of 1004 4944 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 66 PID 4944 wrote to memory of 1004 4944 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 66 PID 4944 wrote to memory of 1004 4944 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 66 PID 4944 wrote to memory of 1004 4944 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 66 PID 4944 wrote to memory of 1004 4944 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 66 PID 1004 wrote to memory of 2760 1004 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 67 PID 1004 wrote to memory of 2760 1004 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 67 PID 1004 wrote to memory of 2760 1004 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 67 PID 1004 wrote to memory of 4572 1004 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 68 PID 1004 wrote to memory of 4572 1004 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 68 PID 1004 wrote to memory of 4572 1004 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 68 PID 4572 wrote to memory of 4992 4572 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 70 PID 4572 wrote to memory of 4992 4572 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 70 PID 4572 wrote to memory of 4992 4572 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 70 PID 4572 wrote to memory of 4992 4572 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 70 PID 4572 wrote to memory of 4992 4572 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 70 PID 4572 wrote to memory of 4992 4572 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 70 PID 4572 wrote to memory of 4992 4572 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 70 PID 4572 wrote to memory of 4992 4572 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 70 PID 4572 wrote to memory of 4992 4572 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 70 PID 4572 wrote to memory of 4992 4572 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 70 PID 4992 wrote to memory of 4712 4992 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 71 PID 4992 wrote to memory of 4712 4992 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 71 PID 4992 wrote to memory of 4712 4992 783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe 71 PID 4712 wrote to memory of 444 4712 build3.exe 72 PID 4712 wrote to memory of 444 4712 build3.exe 72 PID 4712 wrote to memory of 444 4712 build3.exe 72 PID 4756 wrote to memory of 340 4756 mstsca.exe 75 PID 4756 wrote to memory of 340 4756 mstsca.exe 75 PID 4756 wrote to memory of 340 4756 mstsca.exe 75
Processes
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C:\Users\Admin\AppData\Local\Temp\783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe"C:\Users\Admin\AppData\Local\Temp\783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4944 -
C:\Users\Admin\AppData\Local\Temp\783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe"C:\Users\Admin\AppData\Local\Temp\783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe"2⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1004 -
C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\4251ab14-0782-4d39-b304-f9f99e2a2e5f" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
PID:2760
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C:\Users\Admin\AppData\Local\Temp\783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe"C:\Users\Admin\AppData\Local\Temp\783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4572 -
C:\Users\Admin\AppData\Local\Temp\783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe"C:\Users\Admin\AppData\Local\Temp\783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4992 -
C:\Users\Admin\AppData\Local\fb2f4f0c-7ce2-4c89-94a7-cba034363b39\build3.exe"C:\Users\Admin\AppData\Local\fb2f4f0c-7ce2-4c89-94a7-cba034363b39\build3.exe"5⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:4712 -
C:\Windows\SysWOW64\schtasks.exe/C /create /F /sc minute /mo 1 /tn "Azure-Update-Task" /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe"6⤵
- Creates scheduled task(s)
PID:444
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C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exeC:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe1⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:4756 -
C:\Windows\SysWOW64\schtasks.exe/C /create /F /sc minute /mo 1 /tn "Azure-Update-Task" /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe"2⤵
- Creates scheduled task(s)
PID:340
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
Filesize2KB
MD56f59ed058aa06aaf5ec6213b955aabd4
SHA1baf7b828a563b8fb6111e4ce35e0055575ad80b4
SHA2562d82e2629fa2e08f28b43b15da43dff56c7f4b23b39d66109c7c61998e35b4d5
SHA5126b0f041dafb98b9eaf70ac0d20a98c56e1c42231c4a4ae6e11582b20d20bf8f96dfd7747739a10d77368994441adb0e181b356f8569697b1f22ab4fe931170ce
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
Filesize1KB
MD50698dbc93ba7b6bef73ba316695f8317
SHA1a444078ff1eb7c88f52cb4e324365926b491ed47
SHA256263292040d77903899257c1d21201dc64d6f8d6b5a1d945cd5b28d0124d7906c
SHA512ebacaa7009aebb88199cd70fd0bb3afe69ed300318cb633edd1c0404e42aef829617f589bcbad6cb7ab4bd0a8ae87f7df1435c786184ecc5de61c8fc6950a900
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
Filesize488B
MD583b16f04e0170656f1235b44e802929a
SHA18cdb3a0e14baf284e414b3986fba0719062ac440
SHA256ba49d0baf4f2e5703f87af77f8c274a240d1b70bde04e31105772cfc6f68ae97
SHA5129af73c75c8d5afec07fd2114d0aa08a7080807034d505547ba3287effce93f62866301d5405771e1e908664e8dedc6b46d99a44df3a08e990dec0e401dc7d84e
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
Filesize482B
MD516e33633b35c7dfb07fd7a98e7a6b47d
SHA1ff2116a28994b89aed8580b0a904bb90833cec11
SHA256c60ee1b36692b1e1f2aecdd70a84b4bfdad77ce60260789121a67a43de9d2d42
SHA512c1333a9f1336fe15e90416270ff3ab9f12f925cac0ecfada6f2d6c136076713b7a3b635c795866d74e550ffc7fa43b2b7c9b8915f1e4a7b98cb83eec2fe3bbf1
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C:\Users\Admin\AppData\Local\4251ab14-0782-4d39-b304-f9f99e2a2e5f\783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813.exe
Filesize790KB
MD5d22496b92fa86f2233003edfe5b83fd1
SHA1c3b395a05b9f9dd69acf6662a410e3a0865c1df5
SHA256783b9eba13de54091ddedbfc987ccd321bd34a41457de412e635121ebb78f813
SHA51220571f3bfcf1ca7f445890c4834c4c2339c3ee56530fc9926c53cd9c7aec8237a7a43a5ad44ce6ec12663ea167f1e6c02ca29304b2dfc71ebe797b654e17333f
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Filesize
9KB
MD59ead10c08e72ae41921191f8db39bc16
SHA1abe3bce01cd34afc88e2c838173f8c2bd0090ae1
SHA2568d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
SHA512aa35dbc59a3589df2763e76a495ce5a9e62196628b4c1d098add38bd7f27c49edf93a66fb8507fb746e37ee32932da2460e440f241abe1a5a279abcc1e5ffe4a
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Filesize
9KB
MD59ead10c08e72ae41921191f8db39bc16
SHA1abe3bce01cd34afc88e2c838173f8c2bd0090ae1
SHA2568d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
SHA512aa35dbc59a3589df2763e76a495ce5a9e62196628b4c1d098add38bd7f27c49edf93a66fb8507fb746e37ee32932da2460e440f241abe1a5a279abcc1e5ffe4a
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Filesize
9KB
MD59ead10c08e72ae41921191f8db39bc16
SHA1abe3bce01cd34afc88e2c838173f8c2bd0090ae1
SHA2568d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
SHA512aa35dbc59a3589df2763e76a495ce5a9e62196628b4c1d098add38bd7f27c49edf93a66fb8507fb746e37ee32932da2460e440f241abe1a5a279abcc1e5ffe4a
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Filesize
9KB
MD59ead10c08e72ae41921191f8db39bc16
SHA1abe3bce01cd34afc88e2c838173f8c2bd0090ae1
SHA2568d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
SHA512aa35dbc59a3589df2763e76a495ce5a9e62196628b4c1d098add38bd7f27c49edf93a66fb8507fb746e37ee32932da2460e440f241abe1a5a279abcc1e5ffe4a