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Analysis
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max time kernel
76s -
max time network
138s -
platform
windows10-1703_x64 -
resource
win10-20220812-en -
resource tags
arch:x64arch:x86image:win10-20220812-enlocale:en-usos:windows10-1703-x64system -
submitted
06/09/2022, 15:35
Static task
static1
Behavioral task
behavioral1
Sample
aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe
Resource
win10-20220812-en
General
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Target
aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe
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Size
778KB
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MD5
4df0d4112dd43dab559098daab5a36a5
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SHA1
06737287c3efb54280857ed97f4888a9bf10c2d4
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SHA256
aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8
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SHA512
1dfbff68cb2a9fa3cba94f204e10ef4215a102a0b71666fe9257e4c1de85bb0ed5e9f84747ac20800ea34a2ffb87ab8f3bcf13643da3302b69199be139f9bef3
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SSDEEP
12288:3ULzSGNblGIx3WqoGYewEXJt09SpwMdqbbVikDx0mmw5vZ7Y8j0Zi:klFUIx3YeF5amwMdqbbokTmw5pCZ
Malware Config
Extracted
djvu
http://acacaca.org/test3/get.php
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extension
.oovb
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offline_id
6GXhR4uyHH9NXT2qot14T0HeNSviNKH0Q6PGVNt1
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payload_url
http://rgyui.top/dl/build2.exe
http://acacaca.org/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/2628-145-0x0000000002710000-0x000000000282B000-memory.dmp family_djvu behavioral1/memory/4060-150-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4060-151-0x0000000000424141-mapping.dmp family_djvu behavioral1/memory/4060-157-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4060-202-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4060-250-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4080-277-0x0000000000424141-mapping.dmp family_djvu behavioral1/memory/4080-350-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4080-472-0x0000000000400000-0x0000000000537000-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 5012 build2.exe 1324 build2.exe -
Loads dropped DLL 3 IoCs
pid Process 1324 build2.exe 1324 build2.exe 1324 build2.exe -
Modifies file permissions 1 TTPs 1 IoCs
pid Process 1184 icacls.exe -
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
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Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-2482096546-1136599444-1359412500-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\a946c100-2f0e-479b-97b7-c295b074a9f0\\aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe\" --AutoStart" aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe -
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
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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 3 IoCs
description pid Process procid_target PID 2628 set thread context of 4060 2628 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 66 PID 4200 set thread context of 4080 4200 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 70 PID 5012 set thread context of 1324 5012 build2.exe 72 -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Program crash 1 IoCs
pid pid_target Process procid_target 4924 1324 WerFault.exe 72 -
Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
description ioc Process Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 build2.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString build2.exe -
Suspicious behavior: EnumeratesProcesses 6 IoCs
pid Process 4060 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 4060 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 4080 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 4080 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 1324 build2.exe 1324 build2.exe -
Suspicious use of WriteProcessMemory 38 IoCs
description pid Process procid_target PID 2628 wrote to memory of 4060 2628 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 66 PID 2628 wrote to memory of 4060 2628 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 66 PID 2628 wrote to memory of 4060 2628 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 66 PID 2628 wrote to memory of 4060 2628 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 66 PID 2628 wrote to memory of 4060 2628 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 66 PID 2628 wrote to memory of 4060 2628 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 66 PID 2628 wrote to memory of 4060 2628 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 66 PID 2628 wrote to memory of 4060 2628 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 66 PID 2628 wrote to memory of 4060 2628 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 66 PID 2628 wrote to memory of 4060 2628 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 66 PID 4060 wrote to memory of 1184 4060 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 67 PID 4060 wrote to memory of 1184 4060 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 67 PID 4060 wrote to memory of 1184 4060 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 67 PID 4060 wrote to memory of 4200 4060 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 68 PID 4060 wrote to memory of 4200 4060 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 68 PID 4060 wrote to memory of 4200 4060 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 68 PID 4200 wrote to memory of 4080 4200 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 70 PID 4200 wrote to memory of 4080 4200 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 70 PID 4200 wrote to memory of 4080 4200 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 70 PID 4200 wrote to memory of 4080 4200 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 70 PID 4200 wrote to memory of 4080 4200 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 70 PID 4200 wrote to memory of 4080 4200 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 70 PID 4200 wrote to memory of 4080 4200 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 70 PID 4200 wrote to memory of 4080 4200 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 70 PID 4200 wrote to memory of 4080 4200 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 70 PID 4200 wrote to memory of 4080 4200 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 70 PID 4080 wrote to memory of 5012 4080 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 71 PID 4080 wrote to memory of 5012 4080 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 71 PID 4080 wrote to memory of 5012 4080 aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe 71 PID 5012 wrote to memory of 1324 5012 build2.exe 72 PID 5012 wrote to memory of 1324 5012 build2.exe 72 PID 5012 wrote to memory of 1324 5012 build2.exe 72 PID 5012 wrote to memory of 1324 5012 build2.exe 72 PID 5012 wrote to memory of 1324 5012 build2.exe 72 PID 5012 wrote to memory of 1324 5012 build2.exe 72 PID 5012 wrote to memory of 1324 5012 build2.exe 72 PID 5012 wrote to memory of 1324 5012 build2.exe 72 PID 5012 wrote to memory of 1324 5012 build2.exe 72
Processes
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C:\Users\Admin\AppData\Local\Temp\aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe"C:\Users\Admin\AppData\Local\Temp\aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2628 -
C:\Users\Admin\AppData\Local\Temp\aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe"C:\Users\Admin\AppData\Local\Temp\aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe"2⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4060 -
C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\a946c100-2f0e-479b-97b7-c295b074a9f0" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
PID:1184
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C:\Users\Admin\AppData\Local\Temp\aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe"C:\Users\Admin\AppData\Local\Temp\aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4200 -
C:\Users\Admin\AppData\Local\Temp\aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe"C:\Users\Admin\AppData\Local\Temp\aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4080 -
C:\Users\Admin\AppData\Local\37876fca-2e7e-475b-bb06-9ea794a85415\build2.exe"C:\Users\Admin\AppData\Local\37876fca-2e7e-475b-bb06-9ea794a85415\build2.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:5012 -
C:\Users\Admin\AppData\Local\37876fca-2e7e-475b-bb06-9ea794a85415\build2.exe"C:\Users\Admin\AppData\Local\37876fca-2e7e-475b-bb06-9ea794a85415\build2.exe"6⤵
- Executes dropped EXE
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
PID:1324 -
C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 1324 -s 17727⤵
- Program crash
PID:4924
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
Filesize2KB
MD59cd19ed49787d5bf969ac81a2dbf7ce9
SHA14ff7b3372f9778f210014bdd7989d6f9442caa37
SHA2565e317a2565c34c5d13efedd5a58537a9f255df17457a567e5fcc061962475b22
SHA512589a98c719b6f67e875cc05438d4801d8025e8661bc30d51351df864314f0f4e5f35aa27422954a43eddd9ca04903043b46a47335311586f709e8eeae87cf7b9
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
Filesize1KB
MD57c27ffae0cbd6d55b86f387667635294
SHA16df10a537a970852086711da85ae84f7355bff72
SHA256b6a9400010fea1af51104c2b48fdd4383d8b7a81bd62a22c188db3cdb7413503
SHA512140752fd448ed5cd01c5463d67b7dd2c5c111fd4256d3686b792bc0ff788bed49fdfe901402fdb080b9a6c0789725dda6256280120fadc5aca1f127a552e13d6
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
Filesize488B
MD538417a7ba03ecbb9c0a551ad93e72717
SHA124e8302ebdede7ffba436afbdc3c2e51481b8c4c
SHA2560164dea8bbbcfb0196d4c0138a32c7946080d9635d3d02b1de88d5224071a0f7
SHA512da568a8662dcdd503c0e035febb6723b7cc89db14024c46076bed65a45d3cb4e1f8f67f5fc5035e97d0cb1504e48514341d88ca8c271089a2caed0fd8785c217
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
Filesize482B
MD51a4c3314c2030bb451f2c107c19a67b0
SHA14bb12ac992cd4ca15447dbc4230d15ad3add3baf
SHA256225cd67f4ed8c9b8f4658f98aa2bffeca1e473e7972af0666263116ffb161464
SHA51280820dab57dd36c3d5a36c8278cd72df188070f35a9bf432432c255cd052af17c340ffb47b88fbb1f3a7ccc41f7b3bb167936c891038575ca668dfd8b23e4b00
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Filesize
383KB
MD58d7db6982df46c3b0f0cc879d892c08a
SHA164e3d7ab4793aeb05d18a82159c579e05c45fd71
SHA256116e15e94d70dde65f91f155580bd9b34ff1956b9ebe1a53b6bce912b281c1f6
SHA5120eeb242e6e1356a2a9e3183f12439ef36fac40e27ac8c0df5f591c7b3c1324145627c92c3fee15aedee2c1e8cc3b966152af73a33196166c2c1bfbbd979bdb5b
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Filesize
383KB
MD58d7db6982df46c3b0f0cc879d892c08a
SHA164e3d7ab4793aeb05d18a82159c579e05c45fd71
SHA256116e15e94d70dde65f91f155580bd9b34ff1956b9ebe1a53b6bce912b281c1f6
SHA5120eeb242e6e1356a2a9e3183f12439ef36fac40e27ac8c0df5f591c7b3c1324145627c92c3fee15aedee2c1e8cc3b966152af73a33196166c2c1bfbbd979bdb5b
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Filesize
383KB
MD58d7db6982df46c3b0f0cc879d892c08a
SHA164e3d7ab4793aeb05d18a82159c579e05c45fd71
SHA256116e15e94d70dde65f91f155580bd9b34ff1956b9ebe1a53b6bce912b281c1f6
SHA5120eeb242e6e1356a2a9e3183f12439ef36fac40e27ac8c0df5f591c7b3c1324145627c92c3fee15aedee2c1e8cc3b966152af73a33196166c2c1bfbbd979bdb5b
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C:\Users\Admin\AppData\Local\a946c100-2f0e-479b-97b7-c295b074a9f0\aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8.exe
Filesize778KB
MD54df0d4112dd43dab559098daab5a36a5
SHA106737287c3efb54280857ed97f4888a9bf10c2d4
SHA256aff93a8e6265ae3f03f5a2faffb22b720a69e9948de001246cde0c7099ae05f8
SHA5121dfbff68cb2a9fa3cba94f204e10ef4215a102a0b71666fe9257e4c1de85bb0ed5e9f84747ac20800ea34a2ffb87ab8f3bcf13643da3302b69199be139f9bef3
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Filesize
133KB
MD58f73c08a9660691143661bf7332c3c27
SHA137fa65dd737c50fda710fdbde89e51374d0c204a
SHA2563fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd
SHA5120042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89
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Filesize
1.2MB
MD5bfac4e3c5908856ba17d41edcd455a51
SHA18eec7e888767aa9e4cca8ff246eb2aacb9170428
SHA256e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78
SHA5122565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66
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Filesize
630KB
MD5e477a96c8f2b18d6b5c27bde49c990bf
SHA1e980c9bf41330d1e5bd04556db4646a0210f7409
SHA25616574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660
SHA512335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c