Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 501711efbdc0885b…

MALICIOUS

RTF / .DOC

1018.0 KB Created: 2021-09-29 07:24:00
MD5: 75280b763b5bc1597b847a541094b0a3 SHA-1: 4b852efd272df732fdcefd5c948fb505bf474ba7 SHA-256: 501711efbdc0885bdc7beed2a9308d53f4d3f66409f6bcfcac6d2f2e101595d9
262 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1566.001 Phishing: Spearphishing Attachment

The RTF file contains multiple indicators of malicious OLE object embedding, including excessive hex data and automatic linking. Crucially, the critical heuristic firing for CVE-2017-8759 indicates exploitation of MSXML SAX. This suggests the file is designed to exploit this vulnerability, likely to download and execute a secondary payload. The presence of embedded OLE objects and the specific CVE targeted point towards a malicious document designed for exploitation.

Heuristics 8

  • 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.
  • Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED
    RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1002KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 3 \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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000b2451.bin
f49f03575026d1f98b7e0eb44b5325f14e7033c0b64822159b2a47d9bd2b6e62		 rtf-objdata-decoded RTF \objdata at offset 0xB2451 59037 bytes
objdata_01_off000d049e.bin
9d9bc825f2fa5e0ed8db7dce6823e199ad9c775873472d42887214589f205470		 rtf-objdata-decoded RTF \objdata at offset 0xD049E 2632 bytes
objdata_02_off000d1a41.bin
44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037		 rtf-objdata-decoded RTF \objdata at offset 0xD1A41 12297 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.