RTF / .DOC malware analysis — malicious · e3ceb41eca384e43

MALICIOUS

RTF / .DOC

280.5 KB

MD5: 7ca6388377fae1582048f884df8b1092 SHA-1: db3aa194fd3af3c48525a591ceee2c85066577f3 SHA-256: e3ceb41eca384e43d68fafa798a435335fbe96de63c5d389951f4a6cb2c28e2a

182 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 that leverages the Equation Editor vulnerability (CVE-2017-11882). The heuristic firings indicate the presence of an OLE object with a split hex Equation Editor ProgID and a native payload, strongly suggesting exploitation of this known vulnerability. The ".objupdate" directive further supports the automatic activation of the embedded object. The extracted artifact is a high-entropy MZ executable, indicating it is likely a second-stage payload.

Heuristics 5

Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED

RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
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 2 \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_off000007dd.bin` `2ecec3adefc305cf5f34dcdaf6e3483ec174d006fe2dc06478eefc81b366adf0`	rtf-objdata-decoded	RTF \objdata at offset 0x7DD	142426 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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