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MALPEDIA_Win_Fobber_Auto

autogenerated rule brought to you by yara-signator

MalwareFobberMalpedia 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: Fobber.

It defines 16 patterns (0 text, 16 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-fobber-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Fobber_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "6b10b0b7-aac9-5b0d-999e-cef97191d4ff"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.fobber"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.fobber_auto.yar#L1-L171"
		license_url = "N/A"
		logic_hash = "116b887c67ba2a8cdb51d9e66252babb8d46a5aed6610b6604df9d6e868cdbe7"
		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 = { 0fb066f5 75f6 66b80100 660fc146f9 }
		$sequence_1 = { 740f 8d4d08 51 ff31 ffd0 }
		$sequence_2 = { 89e5 ff750c 6800300000 ff7508 }
		$sequence_3 = { 7607 49 01cf 01ce 41 }
		$sequence_4 = { 8b750c 8b4d10 39f7 760e }
		$sequence_5 = { ff7510 ff750c ff7508 e8???????? 85c0 7407 50 }
		$sequence_6 = { 760e 8d0431 39f8 7607 49 }
		$sequence_7 = { 31c9 f7d1 fc f2ae f7d1 49 89c8 }
		$sequence_8 = { 05b05ec972 0100 0000 6a08 e8???????? 59 }
		$sequence_9 = { 38d7 6a00 bc711fb37c 0474 04f0 }
		$sequence_10 = { c072e458 c072c458 c072a458 c0728458 }
		$sequence_11 = { 3bd6 7409 668b08 66890a 83c202 ff07 6a22 }
		$sequence_12 = { 6802000080 ff15???????? 8d45f8 50 68???????? 6805000080 }
		$sequence_13 = { ebd8 8bff 55 8bec 837d0800 56 8bf1 }
		$sequence_14 = { 6300 0081efe2c5fe ff81c7c34c00 0081efc52500 0081efb55100 0081ef272400 }
		$sequence_15 = { 81c6e9140000 81eefa360000 81eef8e4ffff 81c6507c0000 81eeb77a0000 81ee0b690000 81c6cf450000 }

	condition:
		7 of them and filesize < 188416
}

Strings (16 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 0fb066f5 75f6 66b80100 660fc146f9 }
$sequence_1hex{ 740f 8d4d08 51 ff31 ffd0 }
$sequence_2hex{ 89e5 ff750c 6800300000 ff7508 }
$sequence_3hex{ 7607 49 01cf 01ce 41 }
$sequence_4hex{ 8b750c 8b4d10 39f7 760e }
$sequence_5hex{ ff7510 ff750c ff7508 e8???????? 85c0 7407 50 }
$sequence_6hex{ 760e 8d0431 39f8 7607 49 }
$sequence_7hex{ 31c9 f7d1 fc f2ae f7d1 49 89c8 }
$sequence_8hex{ 05b05ec972 0100 0000 6a08 e8???????? 59 }
$sequence_9hex{ 38d7 6a00 bc711fb37c 0474 04f0 }
$sequence_10hex{ c072e458 c072c458 c072a458 c0728458 }
$sequence_11hex{ 3bd6 7409 668b08 66890a 83c202 ff07 6a22 }
$sequence_12hex{ 6802000080 ff15???????? 8d45f8 50 68???????? 6805000080 }
$sequence_13hex{ ebd8 8bff 55 8bec 837d0800 56 8bf1 }
$sequence_14hex{ 6300 0081efe2c5fe ff81c7c34c00 0081efc52500 0081efb55100 0081ef272400 }
$sequence_15hex{ 81c6e9140000 81eefa360000 81eef8e4ffff 81c6507c0000 81eeb77a0000 81ee0b690000 81c6cf450000 }

Condition

7 of them and filesize < 188416

In plain words (Heuristic)

  • The file must be smaller than 188416 (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: 6b10b0b7-aac9-5b0d-999e-cef97191d4ff

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