Analysis
-
max time kernel
62s -
max time network
31s -
platform
windows7_x64 -
resource
win7-20221111-en -
resource tags
arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system -
submitted
23-11-2022 10:25
Static task
static1
Behavioral task
behavioral1
Sample
606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe
Resource
win7-20221111-en
Behavioral task
behavioral2
Sample
606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe
Resource
win10v2004-20220901-en
General
-
Target
606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe
-
Size
603KB
-
MD5
04d86bc4704975357c9ce4115ff9f3ea
-
SHA1
25be22df1e3d068db5f455471dac167b886864d0
-
SHA256
606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204
-
SHA512
f2170d06a466ce154be310750d6732a95fb93d957887f46b91565b09933344a0a2726f3d7b6bfc7ebda69cc94fb0d2c4b3e99e5f54abb7b2b694f41227ee1b22
-
SSDEEP
12288:AIny5DYTfIE+kAcJY5un3buA19JLkQuicq19ksEwZSQGXCs:+UTfjruWnkq5+sxZSjys
Malware Config
Signatures
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Drops file in Drivers directory 1 IoCs
Processes:
606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exedescription ioc process File created C:\Windows\system32\drivers\nethfdrv.sys 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe -
Executes dropped EXE 5 IoCs
Processes:
installd.exenethtsrv.exenetupdsrv.exenethtsrv.exenetupdsrv.exepid process 1508 installd.exe 1040 nethtsrv.exe 1876 netupdsrv.exe 1936 nethtsrv.exe 1680 netupdsrv.exe -
Loads dropped DLL 13 IoCs
Processes:
606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exeinstalld.exenethtsrv.exenethtsrv.exepid process 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe 1508 installd.exe 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe 1040 nethtsrv.exe 1040 nethtsrv.exe 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe 1936 nethtsrv.exe 1936 nethtsrv.exe 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe -
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
-
Drops file in System32 directory 5 IoCs
Processes:
606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exedescription ioc process File created C:\Windows\SysWOW64\hfnapi.dll 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe File created C:\Windows\SysWOW64\hfpapi.dll 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe File created C:\Windows\SysWOW64\installd.exe 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe File created C:\Windows\SysWOW64\nethtsrv.exe 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe File created C:\Windows\SysWOW64\netupdsrv.exe 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe -
Drops file in Program Files directory 3 IoCs
Processes:
606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exedescription ioc process File created C:\Program Files (x86)\Common Files\Config\data.xml 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe File created C:\Program Files (x86)\Common Files\Config\ver.xml 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe File created C:\Program Files (x86)\Common Files\config\uninstinethnfd.exe 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
-
Runs net.exe
-
Suspicious behavior: LoadsDriver 1 IoCs
Processes:
pid process 464 -
Suspicious use of AdjustPrivilegeToken 1 IoCs
Processes:
nethtsrv.exedescription pid process Token: SeDebugPrivilege 1936 nethtsrv.exe -
Suspicious use of WriteProcessMemory 50 IoCs
Processes:
606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exenet.exenet.exenet.exenet.exedescription pid process target process PID 2020 wrote to memory of 1056 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe net.exe PID 2020 wrote to memory of 1056 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe net.exe PID 2020 wrote to memory of 1056 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe net.exe PID 2020 wrote to memory of 1056 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe net.exe PID 1056 wrote to memory of 904 1056 net.exe net1.exe PID 1056 wrote to memory of 904 1056 net.exe net1.exe PID 1056 wrote to memory of 904 1056 net.exe net1.exe PID 1056 wrote to memory of 904 1056 net.exe net1.exe PID 2020 wrote to memory of 552 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe net.exe PID 2020 wrote to memory of 552 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe net.exe PID 2020 wrote to memory of 552 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe net.exe PID 2020 wrote to memory of 552 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe net.exe PID 552 wrote to memory of 336 552 net.exe net1.exe PID 552 wrote to memory of 336 552 net.exe net1.exe PID 552 wrote to memory of 336 552 net.exe net1.exe PID 552 wrote to memory of 336 552 net.exe net1.exe PID 2020 wrote to memory of 1508 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe installd.exe PID 2020 wrote to memory of 1508 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe installd.exe PID 2020 wrote to memory of 1508 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe installd.exe PID 2020 wrote to memory of 1508 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe installd.exe PID 2020 wrote to memory of 1508 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe installd.exe PID 2020 wrote to memory of 1508 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe installd.exe PID 2020 wrote to memory of 1508 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe installd.exe PID 2020 wrote to memory of 1040 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe nethtsrv.exe PID 2020 wrote to memory of 1040 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe nethtsrv.exe PID 2020 wrote to memory of 1040 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe nethtsrv.exe PID 2020 wrote to memory of 1040 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe nethtsrv.exe PID 2020 wrote to memory of 1876 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe netupdsrv.exe PID 2020 wrote to memory of 1876 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe netupdsrv.exe PID 2020 wrote to memory of 1876 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe netupdsrv.exe PID 2020 wrote to memory of 1876 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe netupdsrv.exe PID 2020 wrote to memory of 1876 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe netupdsrv.exe PID 2020 wrote to memory of 1876 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe netupdsrv.exe PID 2020 wrote to memory of 1876 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe netupdsrv.exe PID 2020 wrote to memory of 428 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe net.exe PID 2020 wrote to memory of 428 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe net.exe PID 2020 wrote to memory of 428 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe net.exe PID 2020 wrote to memory of 428 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe net.exe PID 428 wrote to memory of 1268 428 net.exe net1.exe PID 428 wrote to memory of 1268 428 net.exe net1.exe PID 428 wrote to memory of 1268 428 net.exe net1.exe PID 428 wrote to memory of 1268 428 net.exe net1.exe PID 2020 wrote to memory of 1828 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe net.exe PID 2020 wrote to memory of 1828 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe net.exe PID 2020 wrote to memory of 1828 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe net.exe PID 2020 wrote to memory of 1828 2020 606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe net.exe PID 1828 wrote to memory of 1556 1828 net.exe net1.exe PID 1828 wrote to memory of 1556 1828 net.exe net1.exe PID 1828 wrote to memory of 1556 1828 net.exe net1.exe PID 1828 wrote to memory of 1556 1828 net.exe net1.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe"C:\Users\Admin\AppData\Local\Temp\606a898ee2571558ab58377c450602ff36c23b2e25e802c48f81c964ae5f4204.exe"1⤵
- Drops file in Drivers directory
- Loads dropped DLL
- Drops file in System32 directory
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
PID:2020 -
C:\Windows\SysWOW64\net.exenet stop nethttpservice2⤵
- Suspicious use of WriteProcessMemory
PID:1056 -
C:\Windows\SysWOW64\net1.exeC:\Windows\system32\net1 stop nethttpservice3⤵PID:904
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C:\Windows\SysWOW64\net.exenet stop serviceupdater2⤵
- Suspicious use of WriteProcessMemory
PID:552 -
C:\Windows\SysWOW64\net1.exeC:\Windows\system32\net1 stop serviceupdater3⤵PID:336
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C:\Windows\SysWOW64\installd.exe"C:\Windows\system32\installd.exe" nethfdrv2⤵
- Executes dropped EXE
- Loads dropped DLL
PID:1508 -
C:\Windows\SysWOW64\nethtsrv.exe"C:\Windows\system32\nethtsrv.exe" -nfdi2⤵
- Executes dropped EXE
- Loads dropped DLL
PID:1040 -
C:\Windows\SysWOW64\netupdsrv.exe"C:\Windows\system32\netupdsrv.exe" -nfdi2⤵
- Executes dropped EXE
PID:1876 -
C:\Windows\SysWOW64\net.exenet start nethttpservice2⤵
- Suspicious use of WriteProcessMemory
PID:428 -
C:\Windows\SysWOW64\net1.exeC:\Windows\system32\net1 start nethttpservice3⤵PID:1268
-
C:\Windows\SysWOW64\net.exenet start serviceupdater2⤵
- Suspicious use of WriteProcessMemory
PID:1828 -
C:\Windows\SysWOW64\net1.exeC:\Windows\system32\net1 start serviceupdater3⤵PID:1556
-
C:\Windows\SysWOW64\nethtsrv.exeC:\Windows\SysWOW64\nethtsrv.exe1⤵
- Executes dropped EXE
- Loads dropped DLL
- Suspicious use of AdjustPrivilegeToken
PID:1936
-
C:\Windows\SysWOW64\netupdsrv.exeC:\Windows\SysWOW64\netupdsrv.exe1⤵
- Executes dropped EXE
PID:1680
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
-
Filesize
106KB
MD52680c8ad38575a9c7b8c8c45b94d9d96
SHA13cce1cf54d8a7917f0c0b2e41cd73f9f69661c25
SHA256aec96b3ca2693a631a4f80a268127182aeefd656e28983c6ab4f1c9f31f58b2d
SHA5122cde452f945248a1306866cabf41c7209a967dac078217675c33b6e33ce81d4a01024a7fc4fa1a5b2dce79e7cba4f8d5b6bf9967d2db8cb823d8cf61ff8699d4
-
Filesize
244KB
MD5654d6f20f93e500ca38eaaffef65ccc3
SHA1ebb416a608af7cd34080bb2b44e4f468e1884eb8
SHA256279c360c1fc878c197a3bbe35bacd113bca0bf92631551d9c227737ccae8f43f
SHA5129a740db234870521428a4dc914213d547301bcb5a2968ac541d12056e1c137b73472786566ae4890745116efd3f30ea257cf5bb08b43ad04026204e1cf445a84
-
Filesize
108KB
MD535722da9ff5eb5b3a237f4cada1cbfaa
SHA1aeb9408fcac5ea42d6e457856c39c640a61ff64d
SHA2566cdbaa129029b747f78256a11bb8d51302a0ae616b2567dcdee11811e531c0fc
SHA512d75fcd04169cf26aff1874c095463a385de78b52bae27f4cd22ee28d1ddfd98563a72bfd99da70c11a2bda447f1aacbc5e73529f1f94aba3e2fd0573e3b29d70
-
Filesize
176KB
MD5464ada332c9f65ec026e01f2b1696759
SHA134a0ff2a1286cfc9eaf19423a3a52955405c5986
SHA25691650ac1f81d3b1d2741119f04a598dc176e4b253648c9cde7f78aaa3a256bfa
SHA51261a1ab3cb7e251637b65820e2c08c0eb25583b57813afe19a2e40c6be23eed76c2c958a4b5824bd23b0248ef94e3f93d81a2d3ff4259641172a7f7f2ee7a29d8
-
Filesize
176KB
MD5464ada332c9f65ec026e01f2b1696759
SHA134a0ff2a1286cfc9eaf19423a3a52955405c5986
SHA25691650ac1f81d3b1d2741119f04a598dc176e4b253648c9cde7f78aaa3a256bfa
SHA51261a1ab3cb7e251637b65820e2c08c0eb25583b57813afe19a2e40c6be23eed76c2c958a4b5824bd23b0248ef94e3f93d81a2d3ff4259641172a7f7f2ee7a29d8
-
Filesize
158KB
MD5c8992a6e0db07a2b30b7ccf27d5dd856
SHA11f5a3a38b0441865ab39b8f120b60aaecb0d886a
SHA25667013a440480b3a4917776202bdf3dc9e0b3c63196ff06319809b8bb0a32bea3
SHA512a04763cd930f825af2cdbcab8717c071063327159800a07230f96a614dc906c3f78a9b7bc869769878004a9a58ca491ed4709a354702a9c547eaef83fdb641bd
-
Filesize
158KB
MD5c8992a6e0db07a2b30b7ccf27d5dd856
SHA11f5a3a38b0441865ab39b8f120b60aaecb0d886a
SHA25667013a440480b3a4917776202bdf3dc9e0b3c63196ff06319809b8bb0a32bea3
SHA512a04763cd930f825af2cdbcab8717c071063327159800a07230f96a614dc906c3f78a9b7bc869769878004a9a58ca491ed4709a354702a9c547eaef83fdb641bd
-
Filesize
11KB
MD5c17103ae9072a06da581dec998343fc1
SHA1b72148c6bdfaada8b8c3f950e610ee7cf1da1f8d
SHA256dc58d8ad81cacb0c1ed72e33bff8f23ea40b5252b5bb55d393a0903e6819ae2f
SHA512d32a71aaef18e993f28096d536e41c4d016850721b31171513ce28bbd805a54fd290b7c3e9d935f72e676a1acfb4f0dcc89d95040a0dd29f2b6975855c18986f
-
Filesize
6KB
MD5acc2b699edfea5bf5aae45aba3a41e96
SHA1d2accf4d494e43ceb2cff69abe4dd17147d29cc2
SHA256168a974eaa3f588d759db3f47c1a9fdc3494ba1fa1a73a84e5e3b2a4d58abd7e
SHA512e29ea10ada98c71a18273b04f44f385b120d4e8473e441ce5748cfa44a23648814f2656f429b85440157988c88de776c6ac008dc38bf09cbb746c230a46c69fe
-
Filesize
6KB
MD5acc2b699edfea5bf5aae45aba3a41e96
SHA1d2accf4d494e43ceb2cff69abe4dd17147d29cc2
SHA256168a974eaa3f588d759db3f47c1a9fdc3494ba1fa1a73a84e5e3b2a4d58abd7e
SHA512e29ea10ada98c71a18273b04f44f385b120d4e8473e441ce5748cfa44a23648814f2656f429b85440157988c88de776c6ac008dc38bf09cbb746c230a46c69fe
-
Filesize
6KB
MD5acc2b699edfea5bf5aae45aba3a41e96
SHA1d2accf4d494e43ceb2cff69abe4dd17147d29cc2
SHA256168a974eaa3f588d759db3f47c1a9fdc3494ba1fa1a73a84e5e3b2a4d58abd7e
SHA512e29ea10ada98c71a18273b04f44f385b120d4e8473e441ce5748cfa44a23648814f2656f429b85440157988c88de776c6ac008dc38bf09cbb746c230a46c69fe
-
Filesize
6KB
MD5acc2b699edfea5bf5aae45aba3a41e96
SHA1d2accf4d494e43ceb2cff69abe4dd17147d29cc2
SHA256168a974eaa3f588d759db3f47c1a9fdc3494ba1fa1a73a84e5e3b2a4d58abd7e
SHA512e29ea10ada98c71a18273b04f44f385b120d4e8473e441ce5748cfa44a23648814f2656f429b85440157988c88de776c6ac008dc38bf09cbb746c230a46c69fe
-
Filesize
106KB
MD52680c8ad38575a9c7b8c8c45b94d9d96
SHA13cce1cf54d8a7917f0c0b2e41cd73f9f69661c25
SHA256aec96b3ca2693a631a4f80a268127182aeefd656e28983c6ab4f1c9f31f58b2d
SHA5122cde452f945248a1306866cabf41c7209a967dac078217675c33b6e33ce81d4a01024a7fc4fa1a5b2dce79e7cba4f8d5b6bf9967d2db8cb823d8cf61ff8699d4
-
Filesize
106KB
MD52680c8ad38575a9c7b8c8c45b94d9d96
SHA13cce1cf54d8a7917f0c0b2e41cd73f9f69661c25
SHA256aec96b3ca2693a631a4f80a268127182aeefd656e28983c6ab4f1c9f31f58b2d
SHA5122cde452f945248a1306866cabf41c7209a967dac078217675c33b6e33ce81d4a01024a7fc4fa1a5b2dce79e7cba4f8d5b6bf9967d2db8cb823d8cf61ff8699d4
-
Filesize
106KB
MD52680c8ad38575a9c7b8c8c45b94d9d96
SHA13cce1cf54d8a7917f0c0b2e41cd73f9f69661c25
SHA256aec96b3ca2693a631a4f80a268127182aeefd656e28983c6ab4f1c9f31f58b2d
SHA5122cde452f945248a1306866cabf41c7209a967dac078217675c33b6e33ce81d4a01024a7fc4fa1a5b2dce79e7cba4f8d5b6bf9967d2db8cb823d8cf61ff8699d4
-
Filesize
244KB
MD5654d6f20f93e500ca38eaaffef65ccc3
SHA1ebb416a608af7cd34080bb2b44e4f468e1884eb8
SHA256279c360c1fc878c197a3bbe35bacd113bca0bf92631551d9c227737ccae8f43f
SHA5129a740db234870521428a4dc914213d547301bcb5a2968ac541d12056e1c137b73472786566ae4890745116efd3f30ea257cf5bb08b43ad04026204e1cf445a84
-
Filesize
244KB
MD5654d6f20f93e500ca38eaaffef65ccc3
SHA1ebb416a608af7cd34080bb2b44e4f468e1884eb8
SHA256279c360c1fc878c197a3bbe35bacd113bca0bf92631551d9c227737ccae8f43f
SHA5129a740db234870521428a4dc914213d547301bcb5a2968ac541d12056e1c137b73472786566ae4890745116efd3f30ea257cf5bb08b43ad04026204e1cf445a84
-
Filesize
108KB
MD535722da9ff5eb5b3a237f4cada1cbfaa
SHA1aeb9408fcac5ea42d6e457856c39c640a61ff64d
SHA2566cdbaa129029b747f78256a11bb8d51302a0ae616b2567dcdee11811e531c0fc
SHA512d75fcd04169cf26aff1874c095463a385de78b52bae27f4cd22ee28d1ddfd98563a72bfd99da70c11a2bda447f1aacbc5e73529f1f94aba3e2fd0573e3b29d70
-
Filesize
176KB
MD5464ada332c9f65ec026e01f2b1696759
SHA134a0ff2a1286cfc9eaf19423a3a52955405c5986
SHA25691650ac1f81d3b1d2741119f04a598dc176e4b253648c9cde7f78aaa3a256bfa
SHA51261a1ab3cb7e251637b65820e2c08c0eb25583b57813afe19a2e40c6be23eed76c2c958a4b5824bd23b0248ef94e3f93d81a2d3ff4259641172a7f7f2ee7a29d8
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Filesize
158KB
MD5c8992a6e0db07a2b30b7ccf27d5dd856
SHA11f5a3a38b0441865ab39b8f120b60aaecb0d886a
SHA25667013a440480b3a4917776202bdf3dc9e0b3c63196ff06319809b8bb0a32bea3
SHA512a04763cd930f825af2cdbcab8717c071063327159800a07230f96a614dc906c3f78a9b7bc869769878004a9a58ca491ed4709a354702a9c547eaef83fdb641bd