Analysis
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max time kernel
91s -
max time network
144s -
platform
windows10-2004_x64 -
resource
win10v2004-20221111-en -
resource tags
arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system -
submitted
01/02/2023, 10:35
Static task
static1
Behavioral task
behavioral1
Sample
37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe
Resource
win10v2004-20221111-en
General
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Target
37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe
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Size
734KB
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MD5
87fdb817f23819d66aa76611694525cf
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SHA1
4b4d231ba899be8a4973a96fe86cd34bd79dd05f
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SHA256
37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c
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SHA512
0b24bc7c2883bddb0e0049ee40221a8cbcf268b61d554de9e18b3f161b73c5d4133354e39bcb1dcb251c462b1ca2efc30d7f2a5e0801d80d9f638843afa39ea6
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SSDEEP
12288:yWgrbPVJ5U7ClZ/vv1uSgD3dQX+aH0+PckWY3cZ8uhH/HQdS2oDP2frutBVxuukp:yHJOWlxYSUQXZHrEkxsB/iSND2kzxujp
Malware Config
Extracted
djvu
http://drampik.com/test1/get.php
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extension
.erqw
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offline_id
xVB7l5LcUtDGyghMgGsTvebrKc0RGgDXlN1BoKt1
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payload_url
http://uaery.top/dl/build2.exe
http://drampik.com/files/1/build3.exe
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ransomnote
ATTENTION! Don't worry, you can return all your files! All your files like pictures, databases, documents and other important are encrypted with strongest encryption and unique key. The only method of recovering files is to purchase decrypt tool and unique key for you. This software will decrypt all your encrypted files. What guarantees you have? You can send one of your encrypted file from your PC and we decrypt it for free. But we can decrypt only 1 file for free. File must not contain valuable information. You can get and look video overview decrypt tool: https://we.tl/t-8pCGyFnOj6 Price of private key and decrypt software is $980. Discount 50% available if you contact us first 72 hours, that's price for you is $490. Please note that you'll never restore your data without payment. Check your e-mail "Spam" or "Junk" folder if you don't get answer more than 6 hours. To get this software you need write on our e-mail: [email protected] Reserve e-mail address to contact us: [email protected] Your personal ID: 0639JOsie
Extracted
vidar
2.3
19
https://t.me/mantarlars
https://steamcommunity.com/profiles/76561199474840123
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profile_id
19
Signatures
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Detected Djvu ransomware 10 IoCs
resource yara_rule behavioral1/memory/4312-133-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4312-134-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4312-136-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/2420-137-0x0000000004AA0000-0x0000000004BBB000-memory.dmp family_djvu behavioral1/memory/4312-138-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4312-142-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4812-145-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4812-147-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4812-148-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4812-168-0x0000000000400000-0x0000000000537000-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 4 IoCs
pid Process 1400 build2.exe 4564 build3.exe 3552 build2.exe 3500 mstsca.exe -
Checks computer location settings 2 TTPs 3 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe Key value queried \REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe Key value queried \REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation build2.exe -
Loads dropped DLL 2 IoCs
pid Process 3552 build2.exe 3552 build2.exe -
Modifies file permissions 1 TTPs 1 IoCs
pid Process 4956 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-1-5-21-2386679933-1492765628-3466841596-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\90a70e14-fc84-4773-9874-d5947c119e74\\37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe\" --AutoStart" 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.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 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
flow ioc 21 api.2ip.ua 6 api.2ip.ua -
Suspicious use of SetThreadContext 3 IoCs
description pid Process procid_target PID 2420 set thread context of 4312 2420 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 82 PID 1680 set thread context of 4812 1680 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 88 PID 1400 set thread context of 3552 1400 build2.exe 97 -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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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 -
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 2632 schtasks.exe 1216 schtasks.exe -
Delays execution with timeout.exe 1 IoCs
pid Process 3544 timeout.exe -
Suspicious behavior: EnumeratesProcesses 6 IoCs
pid Process 4312 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 4312 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 4812 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 4812 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 3552 build2.exe 3552 build2.exe -
Suspicious use of WriteProcessMemory 53 IoCs
description pid Process procid_target PID 2420 wrote to memory of 4312 2420 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 82 PID 2420 wrote to memory of 4312 2420 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 82 PID 2420 wrote to memory of 4312 2420 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 82 PID 2420 wrote to memory of 4312 2420 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 82 PID 2420 wrote to memory of 4312 2420 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 82 PID 2420 wrote to memory of 4312 2420 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 82 PID 2420 wrote to memory of 4312 2420 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 82 PID 2420 wrote to memory of 4312 2420 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 82 PID 2420 wrote to memory of 4312 2420 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 82 PID 2420 wrote to memory of 4312 2420 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 82 PID 4312 wrote to memory of 4956 4312 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 83 PID 4312 wrote to memory of 4956 4312 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 83 PID 4312 wrote to memory of 4956 4312 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 83 PID 4312 wrote to memory of 1680 4312 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 84 PID 4312 wrote to memory of 1680 4312 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 84 PID 4312 wrote to memory of 1680 4312 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 84 PID 1680 wrote to memory of 4812 1680 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 88 PID 1680 wrote to memory of 4812 1680 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 88 PID 1680 wrote to memory of 4812 1680 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 88 PID 1680 wrote to memory of 4812 1680 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 88 PID 1680 wrote to memory of 4812 1680 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 88 PID 1680 wrote to memory of 4812 1680 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 88 PID 1680 wrote to memory of 4812 1680 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 88 PID 1680 wrote to memory of 4812 1680 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 88 PID 1680 wrote to memory of 4812 1680 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 88 PID 1680 wrote to memory of 4812 1680 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 88 PID 4812 wrote to memory of 1400 4812 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 92 PID 4812 wrote to memory of 1400 4812 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 92 PID 4812 wrote to memory of 1400 4812 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 92 PID 4812 wrote to memory of 4564 4812 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 93 PID 4812 wrote to memory of 4564 4812 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 93 PID 4812 wrote to memory of 4564 4812 37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe 93 PID 4564 wrote to memory of 2632 4564 build3.exe 94 PID 4564 wrote to memory of 2632 4564 build3.exe 94 PID 4564 wrote to memory of 2632 4564 build3.exe 94 PID 1400 wrote to memory of 3552 1400 build2.exe 97 PID 1400 wrote to memory of 3552 1400 build2.exe 97 PID 1400 wrote to memory of 3552 1400 build2.exe 97 PID 1400 wrote to memory of 3552 1400 build2.exe 97 PID 1400 wrote to memory of 3552 1400 build2.exe 97 PID 1400 wrote to memory of 3552 1400 build2.exe 97 PID 1400 wrote to memory of 3552 1400 build2.exe 97 PID 1400 wrote to memory of 3552 1400 build2.exe 97 PID 1400 wrote to memory of 3552 1400 build2.exe 97 PID 3552 wrote to memory of 3200 3552 build2.exe 100 PID 3552 wrote to memory of 3200 3552 build2.exe 100 PID 3552 wrote to memory of 3200 3552 build2.exe 100 PID 3200 wrote to memory of 3544 3200 cmd.exe 102 PID 3200 wrote to memory of 3544 3200 cmd.exe 102 PID 3200 wrote to memory of 3544 3200 cmd.exe 102 PID 3500 wrote to memory of 1216 3500 mstsca.exe 104 PID 3500 wrote to memory of 1216 3500 mstsca.exe 104 PID 3500 wrote to memory of 1216 3500 mstsca.exe 104
Processes
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C:\Users\Admin\AppData\Local\Temp\37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe"C:\Users\Admin\AppData\Local\Temp\37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2420 -
C:\Users\Admin\AppData\Local\Temp\37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe"C:\Users\Admin\AppData\Local\Temp\37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe"2⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4312 -
C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\90a70e14-fc84-4773-9874-d5947c119e74" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
PID:4956
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C:\Users\Admin\AppData\Local\Temp\37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe"C:\Users\Admin\AppData\Local\Temp\37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1680 -
C:\Users\Admin\AppData\Local\Temp\37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe"C:\Users\Admin\AppData\Local\Temp\37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4812 -
C:\Users\Admin\AppData\Local\a593b5d0-54a6-4871-962a-c6f0034f4f13\build2.exe"C:\Users\Admin\AppData\Local\a593b5d0-54a6-4871-962a-c6f0034f4f13\build2.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1400 -
C:\Users\Admin\AppData\Local\a593b5d0-54a6-4871-962a-c6f0034f4f13\build2.exe"C:\Users\Admin\AppData\Local\a593b5d0-54a6-4871-962a-c6f0034f4f13\build2.exe"6⤵
- Executes dropped EXE
- Checks computer location settings
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:3552 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\a593b5d0-54a6-4871-962a-c6f0034f4f13\build2.exe" & exit7⤵
- Suspicious use of WriteProcessMemory
PID:3200 -
C:\Windows\SysWOW64\timeout.exetimeout /t 68⤵
- Delays execution with timeout.exe
PID:3544
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C:\Users\Admin\AppData\Local\a593b5d0-54a6-4871-962a-c6f0034f4f13\build3.exe"C:\Users\Admin\AppData\Local\a593b5d0-54a6-4871-962a-c6f0034f4f13\build3.exe"5⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:4564 -
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:2632
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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:3500 -
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:1216
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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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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C:\Users\Admin\AppData\Local\90a70e14-fc84-4773-9874-d5947c119e74\37288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c.exe
Filesize734KB
MD587fdb817f23819d66aa76611694525cf
SHA14b4d231ba899be8a4973a96fe86cd34bd79dd05f
SHA25637288bf63f4f3e5a4a7473c1b6901af773e471b1220c1ed90dd1444305b16e6c
SHA5120b24bc7c2883bddb0e0049ee40221a8cbcf268b61d554de9e18b3f161b73c5d4133354e39bcb1dcb251c462b1ca2efc30d7f2a5e0801d80d9f638843afa39ea6
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Filesize
299KB
MD5cacd37281c5470cfc13e6db90942d371
SHA1af9e1477a51858376bd113f8247b4f6ff1b94445
SHA256fe8dd23da7d898858d6a280cd58d4ca332f958a4f9562bf8f364dc4340f9c34c
SHA512cfe21519f4c55583c3c68592812dbfa1170279de5e20b3da6d49f66957e373288650bd8c1a6afcd6d70255356674579b40c1b75a7c154fcc705cc89056ff8d67
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Filesize
299KB
MD5cacd37281c5470cfc13e6db90942d371
SHA1af9e1477a51858376bd113f8247b4f6ff1b94445
SHA256fe8dd23da7d898858d6a280cd58d4ca332f958a4f9562bf8f364dc4340f9c34c
SHA512cfe21519f4c55583c3c68592812dbfa1170279de5e20b3da6d49f66957e373288650bd8c1a6afcd6d70255356674579b40c1b75a7c154fcc705cc89056ff8d67
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Filesize
299KB
MD5cacd37281c5470cfc13e6db90942d371
SHA1af9e1477a51858376bd113f8247b4f6ff1b94445
SHA256fe8dd23da7d898858d6a280cd58d4ca332f958a4f9562bf8f364dc4340f9c34c
SHA512cfe21519f4c55583c3c68592812dbfa1170279de5e20b3da6d49f66957e373288650bd8c1a6afcd6d70255356674579b40c1b75a7c154fcc705cc89056ff8d67
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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