YARA · Malpedia signator rules
MALPEDIA_Win_Zeus_Mailsniffer_Auto
autogenerated rule brought to you by yara-signator
MalwareZeus MailsnifferMalpedia 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: Zeus Mailsniffer.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-zeus-mailsniffer-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Zeus_Mailsniffer_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "aaa8e772-89b4-5a81-a4de-d9c0e696d143"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.zeus_mailsniffer"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.zeus_mailsniffer_auto.yar#L1-L128"
= "N/A"
= "caa1fd0a72d34989de98237506f293f039aa94b0638bba8fb60cbd5148d0d3d9"
= 75
= 75
= "FILE"
= "1"
= "yara-signator v0.6.0"
= "callsandjumps;datarefs;binvalue"
= "20260422"
= "a182e35da64e6d71cb55f125c4d4225196523f14"
= "20260504"
= "CC BY-SA 4.0"
= "TLP:WHITE"
strings:
$sequence_0 = { 6a01 56 e8???????? 83c40c 85c0 7473 807b0e02 }
$sequence_1 = { 895c2424 897c2428 897c242c ff15???????? 85c0 7562 6a25 }
$sequence_2 = { 66837ddc00 8b87a0902d01 7403 6a29 58 8d8dd4fdffff 51 }
$sequence_3 = { 751e 53 8d45f8 50 57 ff750c ff75f4 }
$sequence_4 = { 742c 56 e8???????? 8b45c0 a3???????? }
$sequence_5 = { 0f8632050000 8d7910 897ddc 8945d0 8b47f0 }
$sequence_6 = { 8d44244c 50 8d442454 50 8d44246c 50 }
$sequence_7 = { 0f83e5020000 6639430e 0f83db020000 0fb703 8bf0 2345e8 c1ee09 }
$sequence_8 = { f684241c01000020 59 7407 830d????????10 6a5a 8db424ac070000 58 }
$sequence_9 = { ffd7 85c0 7570 8bc6 50 8d84249c030000 }
condition:
7 of them and filesize < 368640
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 6a01 56 e8???????? 83c40c 85c0 7473 807b0e02 } | |
| $sequence_1 | hex | { 895c2424 897c2428 897c242c ff15???????? 85c0 7562 6a25 } | |
| $sequence_2 | hex | { 66837ddc00 8b87a0902d01 7403 6a29 58 8d8dd4fdffff 51 } | |
| $sequence_3 | hex | { 751e 53 8d45f8 50 57 ff750c ff75f4 } | |
| $sequence_4 | hex | { 742c 56 e8???????? 8b45c0 a3???????? } | |
| $sequence_5 | hex | { 0f8632050000 8d7910 897ddc 8945d0 8b47f0 } | |
| $sequence_6 | hex | { 8d44244c 50 8d442454 50 8d44246c 50 } | |
| $sequence_7 | hex | { 0f83e5020000 6639430e 0f83db020000 0fb703 8bf0 2345e8 c1ee09 } | |
| $sequence_8 | hex | { f684241c01000020 59 7407 830d????????10 6a5a 8db424ac070000 58 } | |
| $sequence_9 | hex | { ffd7 85c0 7570 8bc6 50 8d84249c030000 } |
Condition
7 of them and filesize < 368640In plain words (Heuristic)
- The file must be smaller than 368640 (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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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)
Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.
Rule id: aaa8e772-89b4-5a81-a4de-d9c0e696d143
Metadata
| 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 |
Tags:FILE
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