DITEKSHEN_MALWARE_Win_Xorist

YARA detection rule by ditekSHen · GPL-2.0

Detects Xorist ransomware

rule DITEKSHEN_MALWARE_Win_Xorist: FILE {
  meta:
    description = "Detects Xorist ransomware"
    author      = "ditekSHen"
    id          = "76119441-343d-51c3-90eb-9d54c80a983d"
    date        = "2024-05-28"
    modified    = "2024-05-28"
    reference   = "https://github.com/ditekshen/detection"
    source_url  = "https://github.com/ditekshen/detection/blob/2ddbbe14eea1f342bca2cfd09a643a40ae2fcaf6/yara/malware.yar#L2057-L2078"
    license_url = "https://github.com/ditekshen/detection/blob/2ddbbe14eea1f342bca2cfd09a643a40ae2fcaf6/LICENSE.txt"
    logic_hash  = "b34e3fa065cabcd8d26908866e53ff599631128e1da884e42a2e63d890879eaa"
    score       = 75
    quality     = 75
    tags        = "FILE"
    clamav_sig  = "MALWARE.Win.Ransomware.Xorist"

  strings:
    $x1 = {
      00 4d 00 41 00 47 00 45 00 0b 00 50 00 55 00
      53 00 53 00 59 00 4c 00 49 00 43 00 4b 00 45
      00 52 00
    }
    $x2 = {
      30 70 33 6e 53 4f 75 72 63 33 20 58 30 72 31 35
      37 2c 20 6d 6f 74 68 65 72 66 75 63 6b 65 72 21
      00 70 75 73 73 79 6c 69 63 6b 65 72 00 2e 62 6d
      70 00 2e 00 2e 2e 00 6f 70 65 6e 00 2e 65 78 65
    }
    $s1 = "\\shell\\open\\command" fullword ascii
    $s2 = "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run" fullword ascii
    $s3 = "CRYPTED!" fullword ascii
    $s4 = "Attention!" fullword ascii
    $s5 = "Password:" fullword ascii
    $s6 = { 43 6f 6d 53 70 65 63 00 2f 63 20 64 65 6c 20 22 00 22 20 3e 3e 20 4e 55 4c }

  condition:
    uint16(0) == 0x5a4d and (all of ($x*) or 5 of ($s*) or (1 of ($x*) and 3 of ($s*)))
}

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

28164f04-8526-42e4-a3e5-af2146de0aa9

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

[[ reason ]]

What does this mean?

Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

[[ reason ]]

What do these messages mean?

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

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