Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 b4713e3061572cd6…

MALICIOUS

RTF / .DOC

379.9 KB
MD5: 17ac9f9f9443da1730c17e4899761567 SHA-1: e1729694a77ae764c2efb600a99c84de188320a1 SHA-256: b4713e3061572cd67a3388a95d050da61ce8cd3bd4d160015e0ed7ba8cf3a718
192 Risk Score

Malware Insights

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

The file is an RTF document containing OLE object data, specifically triggering critical heuristics for Equation Editor vulnerabilities. The presence of `RTF_OBJDATA`, `RTF_OBJAUTLINK`, and `RTF_OBJUPDATE` strongly suggests the exploitation of a known vulnerability within the Equation Editor component to embed and activate an OLE object. This object likely serves as a dropper for a secondary payload, indicated by the `EXTRACTED_FILE_STATIC_TRIAGE` heuristic flagging a suspicious carved artifact. The attack pattern is consistent with exploiting this vulnerability to achieve arbitrary code execution, leading to the download and execution of further malicious content.

Heuristics 5

  • 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
  • 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 1 \objdata section(s) — embedded OLE objects
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000008e9.bin
c367cde3590816902959921f6a64b69bbb5fe29ffac63403b68212433fc8f52f		 rtf-objdata-decoded RTF \objdata at offset 0x8E9 129091 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.97, consistent with packed or encrypted content.

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