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MALPEDIA_Win_Dorkbot_Ngrbot_Auto

autogenerated rule brought to you by yara-signator

MalwareDorkbot NgrbotMalpedia 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: Dorkbot Ngrbot.

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

Summary generated from the rule's metadata and condition.

Rule source

win-dorkbot-ngrbot-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Dorkbot_Ngrbot_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "40ac6e00-a500-517c-8ccd-ea97b189e649"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.dorkbot_ngrbot"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.dorkbot_ngrbot_auto.yar#L1-L132"
		license_url = "N/A"
		logic_hash = "63ca81ee65976da32d14a7f4db9541249613a563992e053a81f7d12ece273b64"
		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 = { 25ff000000 038c8604040000 53 6a00 51 e8???????? }
		$sequence_1 = { e8???????? 83c41c a3???????? e8???????? 68???????? 68???????? e8???????? }
		$sequence_2 = { 52 ff15???????? 6a00 8d85f8feffff 50 68???????? e9???????? }
		$sequence_3 = { 51 6a1b e8???????? 50 ff15???????? 5e 85c0 }
		$sequence_4 = { b8???????? 8b08 51 56 e8???????? 83c408 3bc3 }
		$sequence_5 = { 33f6 8da42400000000 a1???????? 6a00 53 57 }
		$sequence_6 = { 837d1000 7507 33c0 5b 8be5 5d c3 }
		$sequence_7 = { 8b550c 50 8b04b508643a02 51 52 50 68???????? }
		$sequence_8 = { 85c0 0f8419010000 8b4e24 8b5618 6a00 51 50 }
		$sequence_9 = { 8b4508 68???????? 50 e8???????? 83c408 f7d8 1bc0 }

	condition:
		7 of them and filesize < 638976
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 25ff000000 038c8604040000 53 6a00 51 e8???????? }
$sequence_1hex{ e8???????? 83c41c a3???????? e8???????? 68???????? 68???????? e8???????? }
$sequence_2hex{ 52 ff15???????? 6a00 8d85f8feffff 50 68???????? e9???????? }
$sequence_3hex{ 51 6a1b e8???????? 50 ff15???????? 5e 85c0 }
$sequence_4hex{ b8???????? 8b08 51 56 e8???????? 83c408 3bc3 }
$sequence_5hex{ 33f6 8da42400000000 a1???????? 6a00 53 57 }
$sequence_6hex{ 837d1000 7507 33c0 5b 8be5 5d c3 }
$sequence_7hex{ 8b550c 50 8b04b508643a02 51 52 50 68???????? }
$sequence_8hex{ 85c0 0f8419010000 8b4e24 8b5618 6a00 51 50 }
$sequence_9hex{ 8b4508 68???????? 50 e8???????? 83c408 f7d8 1bc0 }

Condition

7 of them and filesize < 638976

In plain words (Heuristic)

  • The file must be smaller than 638976 (a cheap guard that skips large files).
  • At least 7 patterns in the rule must match.

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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: 40ac6e00-a500-517c-8ccd-ea97b189e649

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