Resubmissions
10-03-2023 22:01
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221205-g19ldsgh7x 10General
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Target
RustExternal_nls.exe
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Size
658KB
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Sample
221224-x6gessdf7z
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MD5
1ab8dbca5e2bba39723f00907d266de7
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SHA1
729cb808637568f20ac886b3fac5f3cf5ff01dee
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SHA256
c6dda31fa6cb4ce140f62c9ce604672fa4a9ba5d1792f2d77f3cfcb43b3227ac
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SHA512
d1a31848eb9b683793afd36031ef8078ff962c2526272782cf2fca8db11afb71643a46b9ad6bce3ba8dba1b638672205726f6e96c7dd3e887228a2368ec08081
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SSDEEP
12288:3oSO5i2eVUIvybKcEz4MM7S9HdKINesX7j6p9PI8GS0oN2:3ouTVUIvtH4H7aLeO23gRoY
Static task
static1
Behavioral task
behavioral1
Sample
RustExternal_nls.exe
Resource
win7-20221111-en
Behavioral task
behavioral2
Sample
RustExternal_nls.exe
Resource
win10v2004-20220812-en
Malware Config
Extracted
asyncrat
0.5.7B
System Guard Runtime
85.105.88.221:2531
System Guard Runtime
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delay
3
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install
false
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install_file
System Guard Runtime
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install_folder
%AppData%
Extracted
asyncrat
0.5.7B
DefenderSmartScren
217.64.31.3:8437
DefenderSmartScren
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delay
3
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install
false
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install_file
SecurityHealtheurvice.exe
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install_folder
%AppData%
Extracted
asyncrat
0.5.7B
UWUISCOMIC
20.100.196.69:9281
UWUISCOMIC
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delay
3
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install
false
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install_file
DerenderScuriry
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install_folder
%AppData%
Extracted
asyncrat
0.5.7B
DerenderScuriry
20.100.196.69:9281
DerenderScuriry
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delay
3
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install
false
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install_file
DerenderScuriry
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install_folder
%AppData%
Targets
-
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Target
RustExternal_nls.exe
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Size
658KB
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MD5
1ab8dbca5e2bba39723f00907d266de7
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SHA1
729cb808637568f20ac886b3fac5f3cf5ff01dee
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SHA256
c6dda31fa6cb4ce140f62c9ce604672fa4a9ba5d1792f2d77f3cfcb43b3227ac
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SHA512
d1a31848eb9b683793afd36031ef8078ff962c2526272782cf2fca8db11afb71643a46b9ad6bce3ba8dba1b638672205726f6e96c7dd3e887228a2368ec08081
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SSDEEP
12288:3oSO5i2eVUIvybKcEz4MM7S9HdKINesX7j6p9PI8GS0oN2:3ouTVUIvtH4H7aLeO23gRoY
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Async RAT payload
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Blocklisted process makes network request
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Downloads MZ/PE file
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Executes dropped EXE
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Checks computer location settings
Looks up country code configured in the registry, likely geofence.
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Loads dropped DLL
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Adds Run key to start application
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Drops file in System32 directory
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Suspicious use of SetThreadContext
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