RTF / .DOC malware analysis — malicious · c67d0fbb0c875965

MALICIOUS

RTF / .DOC

300.9 KB

MD5: 093af03055feb2bc4efabc883619f244 SHA-1: 83a789c95c368604dac7f2797b0772d3b3f6ecc2 SHA-256: c67d0fbb0c875965cabf25c54bc1f53c470063123b1eb09d2187d9b36b1272d0

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell

The sample is an RTF document that contains an embedded OLE object. Heuristics indicate a critical vulnerability related to CVE-2017-11882, which is a known exploit in the Equation Editor. This exploit is used to execute a malicious payload, likely a second-stage downloader, as suggested by the high-entropy carved artifact. The file's SHA256 hash is included as an IOC.

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 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_off00001900.bin` `8ce5f6fffd3483ec6566fe04cf37df08e226289112743359db22f921204c886e`	rtf-objdata-decoded	RTF \objdata at offset 0x1900	100303 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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