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Modified Visual Basic's Yara rule #992

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Merged
merged 1 commit into from
Aug 5, 2021
Merged

Modified Visual Basic's Yara rule #992

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79 changes: 6 additions & 73 deletions support/yara_patterns/tools/pe/x86/compilers.yara
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Original file line number Diff line number Diff line change
Expand Up @@ -1951,89 +1951,22 @@ rule ms_fortran {
$1 at pe.entry_point
}

rule ms_visual_basic_50_60_01 {
meta:
tool = "C"
name = "Microsoft Visual Basic"
version = "5.0 - 6.0"
pattern = "68????????E8????????00000000000030000000"
strings:
$1 = { 68 ?? ?? ?? ?? E8 ?? ?? ?? ?? 00 00 00 00 00 00 30 00 00 00 }
condition:
$1 at pe.entry_point
}

rule ms_visual_basic_50_60_02 {
meta:
tool = "C"
name = "Microsoft Visual Basic"
version = "5.0 - 6.0"
pattern = "FF25????????????68????????E8??FFFFFF"
strings:
$1 = { FF 25 ?? ?? ?? ?? ?? ?? 68 ?? ?? ?? ?? E8 ?? FF FF FF }
condition:
$1 at pe.entry_point
}

rule ms_visual_basic_50_01 {
meta:
tool = "C"
name = "Microsoft Visual Basic"
version = "5.0"
pattern = "FFFFFF0000000000003000000040000000000000"
start = 7
strings:
$1 = { FF FF FF 00 00 00 00 00 00 30 00 00 00 40 00 00 00 00 00 00 }
condition:
$1 at pe.entry_point + 7
}

rule ms_visual_basic_50_02 {
meta:
tool = "C"
name = "Microsoft Visual Basic"
version = "5.0"
pattern = "FFFFFF0000000000003000000040000000000000"
strings:
$1 = { FF FF FF 00 00 00 00 00 00 30 00 00 00 40 00 00 00 00 00 00 }
condition:
$1 at pe.entry_point
}

rule ms_visual_basic_60_01 {
meta:
tool = "C"
name = "Microsoft Visual Basic"
version = "6.0"
pattern = "5A68????????68????????52E9????FF"
strings:
$1 = { 5A 68 ?? ?? ?? ?? 68 ?? ?? ?? ?? 52 E9 ?? ?? FF }
condition:
$1 at pe.entry_point
}

rule ms_visual_basic_60_02 {
rule ms_visual_basic_60 {
meta:
tool = "C"
name = "Microsoft Visual Basic"
version = "6.0"
pattern = "5A68????????68????????52E9????????000000??00000030000000??000000??000000"
strings:
$1 = { 5A 68 ?? ?? ?? ?? 68 ?? ?? ?? ?? 52 E9 ?? ?? ?? ?? 00 00 00 ?? 00 00 00 30 00 00 00 ?? 00 00 00 ?? 00 00 00 }
condition:
$1 at pe.entry_point
condition:
pe.imports("msvbvm60.dll", 100) or pe.imports("msvbvm60.dll", "ThunRTMain")
}

rule ms_visual_basic_60_03 {
rule ms_visual_basic_50 {
meta:
tool = "C"
name = "Microsoft Visual Basic"
version = "6.0"
pattern = "FF25????????68????????E8??FFFFFF????????????30"
strings:
$1 = { FF 25 ?? ?? ?? ?? 68 ?? ?? ?? ?? E8 ?? FF FF FF ?? ?? ?? ?? ?? ?? 30 }
version = "5.0"
condition:
$1 at pe.entry_point
pe.imports("msvbvm50.dll", 100) or pe.imports("msvbvm50.dll", "ThunRTMain")
}

rule dotnet_01 {
Expand Down