RTF / .DOC malware analysis — malicious · b92dc9deecb80b67

MALICIOUS

RTF / .DOC

457.5 KB

MD5: 573d1e40b798ccb6f898c35dd1009b85 SHA-1: a3740fe420a143baaab21c38c3204cb5a5bccd72 SHA-256: b92dc9deecb80b67f7fd27c5c30f393efe2d1ce3f2d2ef34ba9c6b35ffafa421

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. Heuristic analysis indicates a critical vulnerability related to Equation Editor (CVE-2017-11882) and the presence of a decoded PE file. This strongly suggests the document is designed to exploit this vulnerability to execute arbitrary code. No document body text was available for analysis, but the heuristics are sufficient to determine the attack vector.

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.
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.
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_off00000a3d.bin` `80a503053ccf3879788f94510ddfdbbb101ed13eff269833898a8a1db0ae5e12`	rtf-objdata-decoded	RTF \objdata at offset 0xA3D	232855 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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