RTF / .DOC malware analysis — malicious · bb0760d9f8b3db75

MALICIOUS

RTF / .DOC

86.5 KB First seen: 2023-04-21

MD5: 08b520ee1c5114c0bb80560989512b2c SHA-1: 395fd8e91174771c06312db8cb985b2f33b64acc SHA-256: bb0760d9f8b3db7534743a55dbba41366e0f4c929e1b7a7f67bd02b4b2e24336

162 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF document contains an OLE object that is automatically linked and updated, triggering activation. Heuristics indicate this is related to CVE-2017-11882, a known vulnerability in Microsoft Equation Editor that allows for arbitrary code execution. The embedded object's high entropy suggests it is a packed or encrypted 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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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_off00000095.bin` `e0b4ffb0219ba8fdd14fea1429c28d6b06002fd5cbe23bce34b10f9bfece9b15`	rtf-objdata-decoded	RTF \objdata at offset 0x95	44178 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

Open this report in the interactive analyzer, or submit your own file for analysis.