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MALPEDIA_Win_Kasperagent_Auto

autogenerated rule brought to you by yara-signator

MalwareKasperagentMalpedia signator rulesCreative Commons Attribution-ShareAlike 4.0Compiles with YARA-X
Author
Felix Bilstein - yara-signator at cocacoding dot com
Date
2026-05-04
Modified
2026-05-18
Score / Quality
75 / 75

What this rule detects

autogenerated rule brought to you by yara-signator

Associated malware family: Kasperagent.

It defines 10 patterns (0 text, 10 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-kasperagent-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Kasperagent_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "5d103818-a24d-57d8-a953-8d86615e05a7"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.kasperagent"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.kasperagent_auto.yar#L1-L118"
		license_url = "N/A"
		logic_hash = "149c14d9f1dc141ac24a0c3ce90f722742b57d231c75ec2af7e4d87b916079b3"
		score = 75
		quality = 75
		tags = "FILE"
		version = "1"
		tool = "yara-signator v0.6.0"
		signator_config = "callsandjumps;datarefs;binvalue"
		malpedia_rule_date = "20260422"
		malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
		malpedia_version = "20260504"
		malpedia_license = "CC BY-SA 4.0"
		malpedia_sharing = "TLP:WHITE"

	strings:
		$sequence_0 = { c645fc1d e8???????? 33c9 85c0 0f95c1 85c9 750a }
		$sequence_1 = { 8b08 8b11 50 8b4204 ffd0 8d4db0 8975fc }
		$sequence_2 = { 89542408 3bc2 734d 53 }
		$sequence_3 = { 33c9 85c0 0f95c1 85c9 7517 }
		$sequence_4 = { 663b542420 7428 8bd3 2bd0 d1fa }
		$sequence_5 = { 7cda 33f6 eb02 8bf0 834dfcff 8d8dd0fdffff }
		$sequence_6 = { 2bc1 0bd0 7d0a 51 8b4c242c }
		$sequence_7 = { 8b5500 33c0 66890472 8b442414 5f }
		$sequence_8 = { 668b5602 663b542432 7537 668b4606 663b442436 752c }
		$sequence_9 = { 85c0 740e 33c0 894708 }

	condition:
		7 of them and filesize < 1605632
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ c645fc1d e8???????? 33c9 85c0 0f95c1 85c9 750a }
$sequence_1hex{ 8b08 8b11 50 8b4204 ffd0 8d4db0 8975fc }
$sequence_2hex{ 89542408 3bc2 734d 53 }
$sequence_3hex{ 33c9 85c0 0f95c1 85c9 7517 }
$sequence_4hex{ 663b542420 7428 8bd3 2bd0 d1fa }
$sequence_5hex{ 7cda 33f6 eb02 8bf0 834dfcff 8d8dd0fdffff }
$sequence_6hex{ 2bc1 0bd0 7d0a 51 8b4c242c }
$sequence_7hex{ 8b5500 33c0 66890472 8b442414 5f }
$sequence_8hex{ 668b5602 663b542432 7537 668b4606 663b442436 752c }
$sequence_9hex{ 85c0 740e 33c0 894708 }

Condition

7 of them and filesize < 1605632

In plain words (Heuristic)

  • The file must be smaller than 1605632 (a cheap guard that skips large files).
  • At least 7 patterns in the rule must match.

Test this rule in your browser

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Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.

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References

Licence & attribution

Author: Felix Bilstein - yara-signator at cocacoding dot com

Source repository: Malpedia signator rules @ c901f97b7d

Licence: Creative Commons Attribution-ShareAlike 4.0 (repository licence)

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: 5d103818-a24d-57d8-a953-8d86615e05a7

Metadata

version1
toolyara-signator v0.6.0
signator_configcallsandjumps;datarefs;binvalue
malpedia_rule_date20260422
malpedia_hasha182e35da64e6d71cb55f125c4d4225196523f14
malpedia_version20260504
malpedia_licenseCC BY-SA 4.0
malpedia_sharingTLP:WHITE

Tags:FILE