Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 6f8772b6bf6e4722…

MALICIOUS

RTF / .DOC

340.8 KB
MD5: 90edffcfb711d2e1c5100873d0229912 SHA-1: 4b605b6c3bc58d36d691338e9bdc31a416eb1801 SHA-256: 6f8772b6bf6e4722295030cae4acc05fbcb757feb71d6ccf762bd1f0e9374458
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF document contains OLE object data and composite moniker structures indicative of exploitation for client execution, specifically CVE-2017-8570 which is known to drop SCT scripts. The document body explicitly instructs the user to 'download the document and click Enable Editing', a common lure to bypass macro security settings and facilitate payload execution.

Heuristics 7

  • Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE related CVE_2017_8570
    RTF \objdata decodes to OLE data containing the Composite Moniker — CVE-2017-8570 (drops SCT script) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
  • 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.
  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000965.bin
d691e62e2a27ae8652a6e23cbe409bdf2d7853bff31bb58e60d123bedafd5239		 rtf-objdata-decoded RTF \objdata at offset 0x965 75549 bytes
objdata_01_off00026fdc.bin
18cff8ef194415d33763880bf64011d23305e4b9143b76244b89e1c53b70a0d5		 rtf-objdata-decoded RTF \objdata at offset 0x26FDC 2632 bytes
objdata_02_off0002857f.bin
44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037		 rtf-objdata-decoded RTF \objdata at offset 0x2857F 12297 bytes

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