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MALPEDIA_Win_Photoloader_Auto

autogenerated rule brought to you by yara-signator

MalwarePhotoloaderMalpedia 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: Photoloader.

It defines 18 patterns (0 text, 18 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-photoloader-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Photoloader_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "6c751be1-c2cb-5243-adb8-0d3b0ee080b0"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.photoloader"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.photoloader_auto.yar#L1-L178"
		license_url = "N/A"
		logic_hash = "4ef9abae65ee48675c18344bccc98eacf875c4cac6a37cb56292b6b1626aa103"
		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 = { 25ffffff00 0d00000005 e9???????? 8bd7 397b1c 7640 }
		$sequence_1 = { f7411400000020 7407 8b41f8 3901 }
		$sequence_2 = { 0fa2 894704 33c9 b800000040 }
		$sequence_3 = { 33c9 b800000040 0fa2 895f0c }
		$sequence_4 = { 33ff 8bf7 8d6f10 ff15???????? 0f31 }
		$sequence_5 = { c0c003 0fb6c8 8bc1 83e10f }
		$sequence_6 = { e8???????? 85c0 7512 ff15???????? 25ffffff00 0d00000003 }
		$sequence_7 = { 7417 448bc2 0f31 48c1e220 480bc2 }
		$sequence_8 = { 4c03da 4585c0 7420 498d4b10 f7411400000020 }
		$sequence_9 = { 488bcd ffd0 ff15???????? 25ffffff00 }
		$sequence_10 = { 7512 ff15???????? 25ffffff00 0d00000007 eb4a 397b1c 7629 }
		$sequence_11 = { 55 33ed c744241804000000 56 }
		$sequence_12 = { 7461 8d4c2410 51 8d4c2424 51 53 }
		$sequence_13 = { 89742414 eb1b 8d4101 89742414 89442410 8d4601 }
		$sequence_14 = { 759a 50 51 53 55 }
		$sequence_15 = { 03f8 8d0c7b e8???????? 03f8 }
		$sequence_16 = { 8bf9 33f6 33c9 0fa2 894500 }
		$sequence_17 = { 7504 8907 8bf0 8d6c2410 33c9 b801000080 }

	condition:
		7 of them and filesize < 107520
}

Strings (18 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 25ffffff00 0d00000005 e9???????? 8bd7 397b1c 7640 }
$sequence_1hex{ f7411400000020 7407 8b41f8 3901 }
$sequence_2hex{ 0fa2 894704 33c9 b800000040 }
$sequence_3hex{ 33c9 b800000040 0fa2 895f0c }
$sequence_4hex{ 33ff 8bf7 8d6f10 ff15???????? 0f31 }
$sequence_5hex{ c0c003 0fb6c8 8bc1 83e10f }
$sequence_6hex{ e8???????? 85c0 7512 ff15???????? 25ffffff00 0d00000003 }
$sequence_7hex{ 7417 448bc2 0f31 48c1e220 480bc2 }
$sequence_8hex{ 4c03da 4585c0 7420 498d4b10 f7411400000020 }
$sequence_9hex{ 488bcd ffd0 ff15???????? 25ffffff00 }
$sequence_10hex{ 7512 ff15???????? 25ffffff00 0d00000007 eb4a 397b1c 7629 }
$sequence_11hex{ 55 33ed c744241804000000 56 }
$sequence_12hex{ 7461 8d4c2410 51 8d4c2424 51 53 }
$sequence_13hex{ 89742414 eb1b 8d4101 89742414 89442410 8d4601 }
$sequence_14hex{ 759a 50 51 53 55 }
$sequence_15hex{ 03f8 8d0c7b e8???????? 03f8 }
$sequence_16hex{ 8bf9 33f6 33c9 0fa2 894500 }
$sequence_17hex{ 7504 8907 8bf0 8d6c2410 33c9 b801000080 }

Condition

7 of them and filesize < 107520

In plain words (Heuristic)

  • The file must be smaller than 107520 (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: 6c751be1-c2cb-5243-adb8-0d3b0ee080b0

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