RTF / .DOC malware analysis — malicious · b5b4bd9298fe729c

MALICIOUS

RTF / .DOC

63.2 KB

MD5: 3f179844b0e29d1ddc8b912fc400aea1 SHA-1: 1525723ae6e16b640ce84e3c07fb42cf8a25dd4d SHA-256: b5b4bd9298fe729c05573ba54ab1355862c0bc58e212fcef103ddd93fd1d6a83

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF document contains an embedded OLE object with a split Equation Editor ProgID, indicating an attempt to exploit the Equation Editor vulnerability (CVE-2017-11882). The ".objupdate" directive forces OLE activation, which is a common technique for executing embedded exploits. The extracted objdata artifact further supports the presence of malicious content. The document body contains only a numeric string, providing no contextual lure.

Heuristics 5

Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
\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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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_off00000065.bin` `9d4b6f2a879b967456911da5e1c221d9dfd0c0b02ec51b12acb137c24b895749`	rtf-objdata-decoded	RTF \objdata at offset 0x65	32247 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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