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Update Stealc.yar #2674

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Merged
merged 1 commit into from
Aug 21, 2025
Merged

Update Stealc.yar #2674

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5 changes: 4 additions & 1 deletion data/yara/CAPE/Stealc.yar
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
import "pe"
rule Stealc
{
meta:
Expand All @@ -9,7 +10,9 @@ rule Stealc
$nugget1 = {68 04 01 00 00 6A 00 FF 15 [4] 50 FF 15}
$nugget2 = {64 A1 30 00 00 00 8B 40 0C 8B 40 0C 8B 00 8B 00 8B 40 18 89 45 FC}
condition:
uint16(0) == 0x5A4D and any of them
uint16(0) == 0x5A4D
and not (pe.imports("tier0.dll") or pe.imports("msdart.dll"))
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medium

For better maintainability, it would be helpful to add a comment explaining why tier0.dll and msdart.dll are being excluded. This provides context for future developers who might wonder about this condition and prevents accidental removal. The pull request description mentions this is to reduce false positives, which is great information to capture in the code itself.

        // Exclude common FPs from legitimate software (e.g., Valve Source Engine games).
        and not (pe.imports("tier0.dll") or pe.imports("msdart.dll"))

and any of them
}

rule StealcV2
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