RTF / .DOC malware analysis — malicious · 3aee00d1e37f9122

MALICIOUS

RTF / .DOC

2.42 MB

MD5: 5c34a2b583b5b6fd2c2fb352d36f0ca2 SHA-1: 2f56004bb5700628df57dd93a551f4ca834e273e SHA-256: 3aee00d1e37f912225c22f812cbba093dc7954f2f77fb7832bc5c1d7cb9a8800

162 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Phishing: Spearphishing Attachment

The RTF file contains an embedded OLE object with decoded Equation Editor payload and PE data, indicating exploitation of a vulnerability. The presence of excessive hex data within the object further suggests the hiding of a malicious payload. The file is classified as malicious due to these indicators.

Heuristics 5

Decoded Equation Editor payload + PE critical RTF_EQUATION_EDITOR

RTF decodes to an Equation Editor ProgID adjacent to OLE activation and the same decoded object stream contains embedded PE bytes. This matches the Equation Editor exploit surface used by CVE-2017-11882 / CVE-2018-0802 documents, while requiring payload evidence to avoid flagging benign Equation references.
\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 ~2533KB of hex-encoded data inside \objdata sections — may hide a payload
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.

Filename	Kind	Source	Size
`objdata_00_off0000005a.bin` `02976d3a60ac6af00401ff61e19284a66315ed10da44fabaa6ec8c891138a168`	rtf-objdata-decoded	RTF \objdata at offset 0x5A	1266616 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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