Malicious RTF — malware analysis report

Static analysis result for SHA-256 5a905a50347894f5…

MALICIOUS

RTF

15.4 KB First seen: 2021-11-02
MD5: c6ba82495bffa4f26f891625f18eee78 SHA-1: 00c9c1bcc17038a85b8286ec039e08c75d7b4fac SHA-256: 5a905a50347894f5b45934cd717bf2585251cdc0b0c8fa94fc9cf27f2a76472d
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1059.007 JavaScript

The sample is an RTF document that impersonates Microsoft and uses the IRS as a lure to trick the user into clicking a link to verify their tax information, which is a common credential phishing tactic. The document body contains a warning about external emails and directs the user to verify their IRS Tax information, likely leading to a credential harvesting page. The embedded URLs and the heuristic firings strongly suggest a phishing attack.

Heuristics 3

  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://www.w3.org/TR/REC-html40.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.symanteccloud.com In RTF body
    • https://greenir.weebly.com/In RTF body
    • http://schemas.microsoft.com/office/2004/12/ommlIn RTF body
    • http://www.w3.org/TR/REC-html40In RTF body

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