Analysis
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max time kernel
72s -
max time network
135s -
platform
windows10-1703_x64 -
resource
win10-20220901-en -
resource tags
arch:x64arch:x86image:win10-20220901-enlocale:en-usos:windows10-1703-x64system -
submitted
09/10/2022, 14:02
Static task
static1
Behavioral task
behavioral1
Sample
f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe
Resource
win10-20220901-en
General
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Target
f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe
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Size
791KB
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MD5
bfd1d31196f7df3a2dd5967a6e4e7e6e
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SHA1
cb23db2bb8b778a1f1cc44b49ec6f0f687e61b80
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SHA256
f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0
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SHA512
692e18395deef89509443001cbcd8bbacfaea2a1a080c63a0c46e27af3c58dbc64678fe7a6102cc6e142f718884eb540464f4be0317e208ea039c32f45a5c144
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SSDEEP
12288:23VfnjcfcyK9BnMwXxzRrEEaUz4ic5R09h+3gJmbgdkm4YXJxBqVd:2FfnjPr9BMsz1iUEiORcegJ3km4xV
Malware Config
Extracted
djvu
http://winnlinne.com/test1/get.php
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extension
.tohj
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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/2492-147-0x0000000002370000-0x000000000248B000-memory.dmp family_djvu behavioral1/memory/4832-152-0x0000000000424141-mapping.dmp family_djvu behavioral1/memory/4832-151-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4832-158-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4832-199-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4832-251-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/3172-279-0x0000000000424141-mapping.dmp family_djvu behavioral1/memory/3172-351-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/3172-427-0x0000000000400000-0x0000000000537000-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 4376 build3.exe 1760 mstsca.exe -
Modifies file permissions 1 TTPs 1 IoCs
pid Process 4340 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\\b93d2ff0-2a07-4ae4-b19d-ad02a645ac33\\f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe\" --AutoStart" f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.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 1 api.2ip.ua 2 api.2ip.ua 9 api.2ip.ua -
Suspicious use of SetThreadContext 2 IoCs
description pid Process procid_target PID 2492 set thread context of 4832 2492 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 66 PID 4472 set thread context of 3172 4472 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.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 1056 schtasks.exe 4660 schtasks.exe -
Suspicious behavior: EnumeratesProcesses 4 IoCs
pid Process 4832 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 4832 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 3172 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 3172 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe -
Suspicious use of WriteProcessMemory 35 IoCs
description pid Process procid_target PID 2492 wrote to memory of 4832 2492 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 66 PID 2492 wrote to memory of 4832 2492 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 66 PID 2492 wrote to memory of 4832 2492 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 66 PID 2492 wrote to memory of 4832 2492 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 66 PID 2492 wrote to memory of 4832 2492 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 66 PID 2492 wrote to memory of 4832 2492 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 66 PID 2492 wrote to memory of 4832 2492 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 66 PID 2492 wrote to memory of 4832 2492 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 66 PID 2492 wrote to memory of 4832 2492 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 66 PID 2492 wrote to memory of 4832 2492 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 66 PID 4832 wrote to memory of 4340 4832 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 67 PID 4832 wrote to memory of 4340 4832 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 67 PID 4832 wrote to memory of 4340 4832 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 67 PID 4832 wrote to memory of 4472 4832 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 68 PID 4832 wrote to memory of 4472 4832 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 68 PID 4832 wrote to memory of 4472 4832 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 68 PID 4472 wrote to memory of 3172 4472 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 70 PID 4472 wrote to memory of 3172 4472 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 70 PID 4472 wrote to memory of 3172 4472 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 70 PID 4472 wrote to memory of 3172 4472 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 70 PID 4472 wrote to memory of 3172 4472 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 70 PID 4472 wrote to memory of 3172 4472 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 70 PID 4472 wrote to memory of 3172 4472 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 70 PID 4472 wrote to memory of 3172 4472 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 70 PID 4472 wrote to memory of 3172 4472 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 70 PID 4472 wrote to memory of 3172 4472 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 70 PID 3172 wrote to memory of 4376 3172 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 71 PID 3172 wrote to memory of 4376 3172 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 71 PID 3172 wrote to memory of 4376 3172 f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe 71 PID 4376 wrote to memory of 1056 4376 build3.exe 72 PID 4376 wrote to memory of 1056 4376 build3.exe 72 PID 4376 wrote to memory of 1056 4376 build3.exe 72 PID 1760 wrote to memory of 4660 1760 mstsca.exe 75 PID 1760 wrote to memory of 4660 1760 mstsca.exe 75 PID 1760 wrote to memory of 4660 1760 mstsca.exe 75
Processes
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C:\Users\Admin\AppData\Local\Temp\f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe"C:\Users\Admin\AppData\Local\Temp\f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2492 -
C:\Users\Admin\AppData\Local\Temp\f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe"C:\Users\Admin\AppData\Local\Temp\f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe"2⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4832 -
C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\b93d2ff0-2a07-4ae4-b19d-ad02a645ac33" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
PID:4340
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C:\Users\Admin\AppData\Local\Temp\f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe"C:\Users\Admin\AppData\Local\Temp\f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4472 -
C:\Users\Admin\AppData\Local\Temp\f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe"C:\Users\Admin\AppData\Local\Temp\f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:3172 -
C:\Users\Admin\AppData\Local\4dbb5635-bb07-4104-a273-6b0bbf70f878\build3.exe"C:\Users\Admin\AppData\Local\4dbb5635-bb07-4104-a273-6b0bbf70f878\build3.exe"5⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:4376 -
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:1056
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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:1760 -
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:4660
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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
MD5dbd2ef00711b9e8a65a71435dac362a2
SHA1befb6f2c27daebeef7bcd7ed80c9dc50241bf5b6
SHA2565affc8e9407564299e0b7ce1953b921d33dab949c296198ce30781c952e6a047
SHA512500c02a21467c0f04337258c07a1e5f71da3dbbe2105e8e63881fe064bd4ebac7db8347e5a8e554b384237961e3df35513ff14bdc4a409862ac1eca5c35bf378
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
Filesize1KB
MD54b17013381328e3e6c6496e128289829
SHA177e65de2b337899996a68241226fd97196d9a73d
SHA256c7cd9f2c74cb78237c3ed4e8f1a42ddc1c03c0f64a0ca70aad4a4af1f7182f71
SHA5123fed91eec2c1c6de1f646b8664859691e15a3f04f17df41033616d609ab166309bd821a1190146535c3976c00b687ea1ab6fe4aa1d235b516bf6a79a29887763
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
Filesize488B
MD5fd51ad3e37ab104ee43a996662a79378
SHA1f891a7ad21da074e9da2224d760abfc280f91e06
SHA256b74ff9a03800aa941b7452aa91cbad52ac405ba534ae922f2712b6b064b34506
SHA5121b7b8acf8b9873af90b7d8ee464632d9cb05207260fe16480d12a92938e7d9bcc6e164845c98bc264f6e281bf276465adf4d6e08d579b2914506ba634c939819
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
Filesize482B
MD53281357be2a201d5347d5a318d9de69e
SHA1aa87b6ed3b0b36ddc866ddeb0576e9bbe5e5a776
SHA2566e1a2661e46aa07b058dae7ad784b7ff9b1c1c1db878b4e21262ddbe20a2eb98
SHA5128a6f89b01a3a40339a23d1f9314017cb66908097ebed13bdb61e16547ca2d43756a84577c50031bd10ef12516a43153e052eb173e03f29f85bacf08091007458
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Filesize
9KB
MD59ead10c08e72ae41921191f8db39bc16
SHA1abe3bce01cd34afc88e2c838173f8c2bd0090ae1
SHA2568d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
SHA512aa35dbc59a3589df2763e76a495ce5a9e62196628b4c1d098add38bd7f27c49edf93a66fb8507fb746e37ee32932da2460e440f241abe1a5a279abcc1e5ffe4a
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Filesize
9KB
MD59ead10c08e72ae41921191f8db39bc16
SHA1abe3bce01cd34afc88e2c838173f8c2bd0090ae1
SHA2568d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
SHA512aa35dbc59a3589df2763e76a495ce5a9e62196628b4c1d098add38bd7f27c49edf93a66fb8507fb746e37ee32932da2460e440f241abe1a5a279abcc1e5ffe4a
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C:\Users\Admin\AppData\Local\b93d2ff0-2a07-4ae4-b19d-ad02a645ac33\f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0.exe
Filesize791KB
MD5bfd1d31196f7df3a2dd5967a6e4e7e6e
SHA1cb23db2bb8b778a1f1cc44b49ec6f0f687e61b80
SHA256f6772941ad92d79142edd87d77b5169c2887e0abc28561efb6fed056c287fcc0
SHA512692e18395deef89509443001cbcd8bbacfaea2a1a080c63a0c46e27af3c58dbc64678fe7a6102cc6e142f718884eb540464f4be0317e208ea039c32f45a5c144
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Filesize
9KB
MD59ead10c08e72ae41921191f8db39bc16
SHA1abe3bce01cd34afc88e2c838173f8c2bd0090ae1
SHA2568d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
SHA512aa35dbc59a3589df2763e76a495ce5a9e62196628b4c1d098add38bd7f27c49edf93a66fb8507fb746e37ee32932da2460e440f241abe1a5a279abcc1e5ffe4a
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Filesize
9KB
MD59ead10c08e72ae41921191f8db39bc16
SHA1abe3bce01cd34afc88e2c838173f8c2bd0090ae1
SHA2568d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
SHA512aa35dbc59a3589df2763e76a495ce5a9e62196628b4c1d098add38bd7f27c49edf93a66fb8507fb746e37ee32932da2460e440f241abe1a5a279abcc1e5ffe4a