Malicious RTF — malware analysis report

Static analysis result for SHA-256 047a51bd305dc73c…

MALICIOUS

RTF

241.6 KB First seen: 2022-04-04
MD5: 1c744a0de02d84456781b01854df70b3 SHA-1: 21853a7df1113f38fbe427fa270c769a815c37f4 SHA-256: 047a51bd305dc73c615b3b1ab7cab52bd03b7eb7bc0a9cda83c0664b1805ed3b
180 Risk Score

Malware Insights

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

The RTF file contains multiple indicators of OLE object manipulation, specifically related to Composite Monikers. Heuristics indicate the exploitation of CVE-2017-8570, which is known to drop and execute a script. This suggests the file is designed to execute a malicious payload upon opening.

Heuristics 5

  • 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.
  • \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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000007d0.bin
7849ef77a1b3258e6c763ca136b9fdfec0ccb3c48de086b375b8b1d4cd80a9b8		 rtf-objdata-decoded RTF \objdata at offset 0x7D0 27573 bytes
objdata_01_off0000e876.bin
1721aab459b68b884f13b5caf8aed48f2f1a5eb3d65c1b2ddac08c7c93062de4		 rtf-objdata-decoded RTF \objdata at offset 0xE876 2632 bytes
objdata_02_off0000fe19.bin
44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037		 rtf-objdata-decoded RTF \objdata at offset 0xFE19 12297 bytes

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