Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 1d8d80445f283727…

MALICIOUS

RTF / .DOC

524.2 KB Created: 2019-09-17 13:59:00
MD5: 782af6274367bd5fa46fb5bc18993de0 SHA-1: e2b257b5e95e136bc2a5d39aabdf09b1ddcf1131 SHA-256: 1d8d80445f283727cfb5b21ddfc5042e1128c2a3be180c33376fc47f8d6b146e
240 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is an RTF document containing an embedded OLE object, specifically targeting the Equation Editor vulnerability (CVE-2017-8759). The ".objupdate" directive indicates that the embedded object is automatically activated upon opening. This exploit is commonly used to download and execute a second-stage payload. The heuristic "SE_PASSWORD_ARCHIVE_LURE" suggests the document may also contain instructions for decrypting a password-protected archive, a common tactic to bypass security scanning.

Heuristics 7

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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://schemas.microsoft.com/office/word/2003/wordml

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0007a911.bin
9e4035292b76b6d2338c2b9879af8fe4ecabba026fcfe80245959e963d90fb54		 rtf-objdata-decoded RTF \objdata at offset 0x7A911 3739 bytes

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