Analysis
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max time kernel
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max time network
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platform
windows10-2004_x64 -
resource
win10v2004-20240426-en -
resource tags
arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system -
submitted
14-05-2024 17:09
Behavioral task
behavioral1
Sample
agent.exe
Resource
win7-20240221-en
General
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Target
agent.exe
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Size
9.6MB
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MD5
f318f33943ac090b9872a8ac4045bedf
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SHA1
974da2c9186ca7534a29c9f907cb910668368e5f
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SHA256
75fb9e1511f1005f07cd73c8cc836fcdecc645e4a633c48e7816958e7d792d25
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SHA512
3c46bf23c1ed51e5acada3f4abcf26199283b879d9da0b5ca9b7e4813084c048aade6378a0282ae4a3708b9fd5aef1dfddbdba476812a087bcadc455ebfc7bd2
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SSDEEP
196608:Ph8kqvWOgbU9z8PQ4EXqWkNGC/TkLZ04CTp2CKoojMHXF7lb5ryP1IPJ8czzT:Ph8/vW49zgQ4E6aykl04CkTMhDa+j
Malware Config
Signatures
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Checks computer location settings 2 TTPs 5 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-711569230-3659488422-571408806-1000\Control Panel\International\Geo\Nation rfusclient.exe Key value queried \REGISTRY\USER\S-1-5-21-711569230-3659488422-571408806-1000\Control Panel\International\Geo\Nation agent.exe Key value queried \REGISTRY\USER\S-1-5-21-711569230-3659488422-571408806-1000\Control Panel\International\Geo\Nation rfusclient.exe Key value queried \REGISTRY\USER\S-1-5-21-711569230-3659488422-571408806-1000\Control Panel\International\Geo\Nation rfusclient.exe Key value queried \REGISTRY\USER\S-1-5-21-711569230-3659488422-571408806-1000\Control Panel\International\Geo\Nation rutserv.exe -
Executes dropped EXE 5 IoCs
pid Process 3092 rfusclient.exe 2524 rfusclient.exe 3652 rutserv.exe 1568 rutserv.exe 2884 rfusclient.exe -
resource yara_rule behavioral2/memory/4548-0-0x0000000000400000-0x0000000000EC5000-memory.dmp upx behavioral2/memory/4548-83-0x0000000000400000-0x0000000000EC5000-memory.dmp upx -
Drops file in System32 directory 12 IoCs
description ioc Process File opened for modification C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\8EB35376744F392396307460D546222D_EC1C46868A78521D3A7ED5209EF9CB19 rutserv.exe File opened for modification C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft rutserv.exe File opened for modification C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache rutserv.exe File opened for modification C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\77EC63BDA74BD0D0E0426DC8F8008506 rutserv.exe File opened for modification C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\378B079587A9184B2E2AB859CB263F40_524AD1B9B08D3C6450727265AE77B7D2 rutserv.exe File opened for modification C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\3C987C966D19B79B9D9F35B962FCC8FA rutserv.exe File opened for modification C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\8EB35376744F392396307460D546222D_EC1C46868A78521D3A7ED5209EF9CB19 rutserv.exe File opened for modification C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData rutserv.exe File opened for modification C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content rutserv.exe File opened for modification C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\77EC63BDA74BD0D0E0426DC8F8008506 rutserv.exe File opened for modification C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\378B079587A9184B2E2AB859CB263F40_524AD1B9B08D3C6450727265AE77B7D2 rutserv.exe File opened for modification C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\3C987C966D19B79B9D9F35B962FCC8FA rutserv.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Modifies data under HKEY_USERS 41 IoCs
description ioc Process Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\Certificates rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CRLs rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\Certificates rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\CRLs rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\CTLs rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\CTLs rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\CTLs rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\Certificates rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\CTLs rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\CRLs rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CTLs rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\CRLs rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\CTLs rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CRLs rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CTLs rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\CTLs rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\Certificates rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\Certificates rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\CRLs rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\Certificates rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\CRLs rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\CRLs rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\Certificates rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\CRLs rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\CTLs rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\Certificates rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\CTLs rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\Certificates rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\Certificates rutserv.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\CRLs rutserv.exe -
Suspicious behavior: EnumeratesProcesses 10 IoCs
pid Process 3652 rutserv.exe 3652 rutserv.exe 3652 rutserv.exe 3652 rutserv.exe 3652 rutserv.exe 3652 rutserv.exe 1568 rutserv.exe 1568 rutserv.exe 1568 rutserv.exe 1568 rutserv.exe -
Suspicious use of AdjustPrivilegeToken 4 IoCs
description pid Process Token: SeDebugPrivilege 3652 rutserv.exe Token: SeTakeOwnershipPrivilege 1568 rutserv.exe Token: SeTcbPrivilege 1568 rutserv.exe Token: SeTcbPrivilege 1568 rutserv.exe -
Suspicious use of FindShellTrayWindow 15 IoCs
pid Process 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe -
Suspicious use of SendNotifyMessage 15 IoCs
pid Process 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe 2884 rfusclient.exe -
Suspicious use of SetWindowsHookEx 8 IoCs
pid Process 3652 rutserv.exe 3652 rutserv.exe 3652 rutserv.exe 3652 rutserv.exe 1568 rutserv.exe 1568 rutserv.exe 1568 rutserv.exe 1568 rutserv.exe -
Suspicious use of WriteProcessMemory 12 IoCs
description pid Process procid_target PID 4548 wrote to memory of 3092 4548 agent.exe 85 PID 4548 wrote to memory of 3092 4548 agent.exe 85 PID 4548 wrote to memory of 3092 4548 agent.exe 85 PID 3092 wrote to memory of 2524 3092 rfusclient.exe 87 PID 3092 wrote to memory of 2524 3092 rfusclient.exe 87 PID 3092 wrote to memory of 2524 3092 rfusclient.exe 87 PID 2524 wrote to memory of 3652 2524 rfusclient.exe 88 PID 2524 wrote to memory of 3652 2524 rfusclient.exe 88 PID 2524 wrote to memory of 3652 2524 rfusclient.exe 88 PID 1568 wrote to memory of 2884 1568 rutserv.exe 91 PID 1568 wrote to memory of 2884 1568 rutserv.exe 91 PID 1568 wrote to memory of 2884 1568 rutserv.exe 91
Processes
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C:\Users\Admin\AppData\Local\Temp\agent.exe"C:\Users\Admin\AppData\Local\Temp\agent.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4548 -
C:\Users\Admin\AppData\Local\Temp\RUT_{8553F95B-DE24-4700-97EF-53DF8E6FE4B4}\rfusclient.exe"C:\Users\Admin\AppData\Local\Temp\RUT_{8553F95B-DE24-4700-97EF-53DF8E6FE4B4}\rfusclient.exe" -deploy2⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:3092 -
C:\Users\Admin\AppData\Roaming\RMS-Agent\68001\E6178AFFB3\rfusclient.exe"C:\Users\Admin\AppData\Roaming\RMS-Agent\68001\E6178AFFB3\rfusclient.exe" -run_agent3⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:2524 -
C:\Users\Admin\AppData\Roaming\RMS-Agent\68001\E6178AFFB3\rutserv.exe"C:\Users\Admin\AppData\Roaming\RMS-Agent\68001\E6178AFFB3\rutserv.exe"4⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
PID:3652 -
C:\Users\Admin\AppData\Roaming\RMS-Agent\68001\E6178AFFB3\rutserv.exeC:\Users\Admin\AppData\Roaming\RMS-Agent\68001\E6178AFFB3\rutserv.exe -second5⤵
- Executes dropped EXE
- Drops file in System32 directory
- Modifies data under HKEY_USERS
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1568 -
C:\Users\Admin\AppData\Roaming\RMS-Agent\68001\E6178AFFB3\rfusclient.exeC:\Users\Admin\AppData\Roaming\RMS-Agent\68001\E6178AFFB3\rfusclient.exe /tray /user6⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
PID:2884
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
114KB
MD5c3d7db3461db0dbb8a1d2a937b1d6252
SHA135fafe6c6812f20454c709b0a43a21bf7e9f66bf
SHA256cf8e39ce145e36d672cb2a140b3f33e0a1337975d7840e1d6a1920ce560bba46
SHA5129759895e5d4f289e6227f65f46b24ad7f2607443bebd9b039f1cf42bd74c986a597d5de4bef70510c4463874a01695ca2f7ccbd231d6ef5316250d7492c48675
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Filesize
52KB
MD5294227da6f9c610c49d38e3965bcdb71
SHA1a6f694235a68fe35ece21d39e736e16053f4b91d
SHA25655fb4c823838b383d077b5c45df2be5fa47abc798054701c23fde5f312379755
SHA5120f3661ca19385d08bbee4419178f7bf9ee7701385c981b94fe81a60438f486c8bea2c048b1bdaf1387265e2d4a1ed4cec2558b7f7fa6d69916c5abbb0b7689a9
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Filesize
150KB
MD559068498190113e051d94fd0b5ef98aa
SHA16b64bb29763c43a86a4be87fcbc94b2f4697ced3
SHA256097c87769734699254c4f85a6268539c2d90245650930f44d245e75bcc4a3e46
SHA512f7093d9b544fcbd3d7336b42eb9c79e17aa2b01910b3a1a23e23036d6230116e1dc3bde0602ab18efcd53c184c77d57348b2dea889c313a4a605d0714ec35ef8
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Filesize
966KB
MD556c10161ff350d143fe51affe777d19f
SHA154abec9bcf95904b666fa5dbdc9b976acb59e79d
SHA2564d4dd771e72a4654063dfb06dafef1fd0701ed93c407e68b0f10782e453564c8
SHA512229fdf7503f76ed00f05711c58d1978df9327b085c750873714a52e10db7d53bc702e800d280bb086faa3b360f0b2eecf7aa953b0f9ed1be7eabdd9793493d85
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Filesize
57KB
MD5cc99020d311e97d6127ab9ddd44c980b
SHA157746de06ba0f206f6ef34c453b5d5cc1f00e136
SHA25637c133f5c437a56c85ee3ca4c921f61c4532b375975c2b2dd9b4b5983e51c66b
SHA5124122f3ef2e454382967ab3ac4e7d5f44f5156b0a97e6ebe98467d399a4281a72bc1a87f26b7f67893a64dbcb6d34e1b7775effaff969e87873b42c43eca336fa
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Filesize
5.5MB
MD5b274f6fe4595bd970e2a14ca27c0ed51
SHA11829e2c4c725e363b566dd0267265dd84f3f924d
SHA2566a285042cf70fc2087c828891d17cc33b33902943a74fec778dc88420ebd05a0
SHA512237d524b345cff6c28bba6aec5e28d3edfc48be04277e0157ede932c857797eac1670cdb1a4979f40f19c3e6635335c944fca03f8c446570c39f5fd5ef8379de
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Filesize
9.5MB
MD5d10dae1197db0b694c832ae512b34024
SHA124757c07c814d53ded645547bc53e29c98919077
SHA25674892811c87f574aea6d8b3a5419845a58096deaece96a9c6f06e5ad4f8859be
SHA512f968b9084c51aa3b4f24cf99ee0d354f323d435ad7c15a884bf16dc3b8d67f721d4c7bb5f111a44033a15d820f58e813e0dccbf1f84bd3ca736a0c57bd98395e
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Filesize
380KB
MD51ea62293ac757a0c2b64e632f30db636
SHA18c8ac6f8f28f432a514c3a43ea50c90daf66bfba
SHA256970cb3e00fa68daec266cd0aa6149d3604cb696853772f20ad67555a2114d5df
SHA512857872a260cd590bd533b5d72e6e830bb0e4e037cb6749bb7d6e1239297f21606cdbe4a0fb1492cdead6f46c88dd9eb6fab5c6e17029f7df5231cefc21fa35ab
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Filesize
1.6MB
MD589770647609ac26c1bbd9cf6ed50954e
SHA1349eed120070bab7e96272697b39e786423ac1d3
SHA2567b4fc8e104914cdd6a7bf3f05c0d7197cfcd30a741cc0856155f2c74e62005a4
SHA512a98688f1c80ca79ee8d15d680a61420ffb49f55607fa25711925735d0e8dbc21f3b13d470f22e0829c72a66a798eee163411b2f078113ad8153eed98ef37a2cc
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Filesize
260KB
MD5d29f7070ee379544aeb19913621c88e6
SHA1499dcdb39862fd8ff5cbc4b13da9c465bfd5f4be
SHA256654f43108fbd56bd2a3c5a3a74a2ff3f19ea9e670613b92a624e86747a496caf
SHA5124ead1c8e0d33f2a6c35163c42e8f0630954de67e63bcadca003691635ccf8bfe709363ec88edb387b956535fdb476bc0b5773ede5b19cacf4858fb50072bbef5
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Filesize
365KB
MD57a9eeac3ceaf7f95f44eb5c57b4db2e3
SHA1be1048c254aa3114358f76d08c55667c4bf2d382
SHA256b497d07ed995b16d1146209158d3b90d85c47a643fbf25a5158b26d75c478c88
SHA512b68fa132c3588637d62a1c2bce8f8acc78e6e2f904a53644d732dc0f4e4fbc61a2829a1ac8f6b97fe4be4f3613ef92c43e6f2ab29c6abd968acc5acd635c990d
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Filesize
860KB
MD55308b9945e348fbe3a480be06885434c
SHA15c3cb39686cca3e9586e4b405fc8e1853caaf8ff
SHA2569dc30fb2118aad48f6a5e0a82504f365fe40abb3134f6cceeb65859f61ad939a
SHA5124d7f08dc738a944bcee9b013b13d595e9c913b248c42a6c095cbdfc6059da7f04cca935841ff8a43687b75bdc5af05e888241e52ef594aa752ba9425cf966412