Analysis
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max time kernel
170s -
max time network
168s -
platform
windows10-2004_x64 -
resource
win10v2004-20220812-en -
resource tags
arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system -
submitted
05-12-2022 23:45
Static task
static1
Behavioral task
behavioral1
Sample
a632ec32237374a4c48d657e3a35af4f59e61704bd9bff5bdf8fd8716a0f34c8.exe
Resource
win7-20220812-en
windows7-x64
8 signatures
150 seconds
Behavioral task
behavioral2
Sample
a632ec32237374a4c48d657e3a35af4f59e61704bd9bff5bdf8fd8716a0f34c8.exe
Resource
win10v2004-20220812-en
windows10-2004-x64
8 signatures
150 seconds
General
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Target
a632ec32237374a4c48d657e3a35af4f59e61704bd9bff5bdf8fd8716a0f34c8.exe
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Size
84KB
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MD5
94f415d41857200d6b7dc748e8f112d7
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SHA1
b262bba105eb45b88b8937943b8a0b7d16de8747
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SHA256
a632ec32237374a4c48d657e3a35af4f59e61704bd9bff5bdf8fd8716a0f34c8
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SHA512
7d94a71ae0b1c538278b2433fac04f3e764987be14e3e229bb526833ac251370fcc78e57482b93a7b259f00b8f05fd0fdb53ec2de70e56503f47b0cd9d05ba3b
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SSDEEP
1536:v88yTb7bg4htUVGLG/wXJYeUj27dTGHq13i6E:0vUVeG/wXJY527Y
Score
10/10
Malware Config
Signatures
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Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 IoCs
description ioc Process Set value (int) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0" a632ec32237374a4c48d657e3a35af4f59e61704bd9bff5bdf8fd8716a0f34c8.exe Set value (int) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0" gstoy.exe -
Executes dropped EXE 1 IoCs
pid Process 2620 gstoy.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-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation a632ec32237374a4c48d657e3a35af4f59e61704bd9bff5bdf8fd8716a0f34c8.exe -
Adds Run key to start application 2 TTPs 29 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /j" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /q" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /m" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /a" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /n" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /y" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /s" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /w" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /l" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /u" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /b" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /t" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /k" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /c" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /x" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /i" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /o" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /e" gstoy.exe Key created \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Windows\CurrentVersion\Run\ gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /p" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /f" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /v" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /z" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /g" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /h" gstoy.exe Key created \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Windows\CurrentVersion\Run\ a632ec32237374a4c48d657e3a35af4f59e61704bd9bff5bdf8fd8716a0f34c8.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /y" a632ec32237374a4c48d657e3a35af4f59e61704bd9bff5bdf8fd8716a0f34c8.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /d" gstoy.exe Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gstoy = "C:\\Users\\Admin\\gstoy.exe /r" gstoy.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Suspicious behavior: EnumeratesProcesses 64 IoCs
pid Process 1944 a632ec32237374a4c48d657e3a35af4f59e61704bd9bff5bdf8fd8716a0f34c8.exe 1944 a632ec32237374a4c48d657e3a35af4f59e61704bd9bff5bdf8fd8716a0f34c8.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe 2620 gstoy.exe -
Suspicious use of SetWindowsHookEx 2 IoCs
pid Process 1944 a632ec32237374a4c48d657e3a35af4f59e61704bd9bff5bdf8fd8716a0f34c8.exe 2620 gstoy.exe -
Suspicious use of WriteProcessMemory 3 IoCs
description pid Process procid_target PID 1944 wrote to memory of 2620 1944 a632ec32237374a4c48d657e3a35af4f59e61704bd9bff5bdf8fd8716a0f34c8.exe 79 PID 1944 wrote to memory of 2620 1944 a632ec32237374a4c48d657e3a35af4f59e61704bd9bff5bdf8fd8716a0f34c8.exe 79 PID 1944 wrote to memory of 2620 1944 a632ec32237374a4c48d657e3a35af4f59e61704bd9bff5bdf8fd8716a0f34c8.exe 79
Processes
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C:\Users\Admin\AppData\Local\Temp\a632ec32237374a4c48d657e3a35af4f59e61704bd9bff5bdf8fd8716a0f34c8.exe"C:\Users\Admin\AppData\Local\Temp\a632ec32237374a4c48d657e3a35af4f59e61704bd9bff5bdf8fd8716a0f34c8.exe"1⤵
- Modifies visiblity of hidden/system files in Explorer
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1944 -
C:\Users\Admin\gstoy.exe"C:\Users\Admin\gstoy.exe"2⤵
- Modifies visiblity of hidden/system files in Explorer
- Executes dropped EXE
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
PID:2620
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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Filesize
84KB
MD5eda041b7ec1f799e56f86e6759608b38
SHA1d882795a628939c4f8e2e1031f18b7e4d366451d
SHA2567c7e0d7e860c96a0894b39860d757fe058f06925e56d671afbd9f6b9cb42ff1b
SHA5124c8a2cdd630060933fa0404663d23a7ee2931032541e8f659aed50f0a1e979a7314cd083a518d0a6695daa6b5dbd318fc7c9827ceefbec73efed979bab5ab8cf
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Filesize
84KB
MD5eda041b7ec1f799e56f86e6759608b38
SHA1d882795a628939c4f8e2e1031f18b7e4d366451d
SHA2567c7e0d7e860c96a0894b39860d757fe058f06925e56d671afbd9f6b9cb42ff1b
SHA5124c8a2cdd630060933fa0404663d23a7ee2931032541e8f659aed50f0a1e979a7314cd083a518d0a6695daa6b5dbd318fc7c9827ceefbec73efed979bab5ab8cf