RTF / .DOC malware analysis — malicious · 78f390c3ee6f2058

MALICIOUS

RTF / .DOC

505.5 KB

MD5: fbc98ad0ad93560a976db3e357deeeb5 SHA-1: d6e00a17bff689c5f988a4a60148679711a7f1e5 SHA-256: 78f390c3ee6f2058dd2aa6e528dc3b70249270fb3107d90b4a47fad7d6843756

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE objects, specifically triggering the CVE-2017-11882 Equation Editor vulnerability. This indicates the file is designed to exploit this known flaw for client execution. The embedded OLE object data, identified as 'objdata_00_off00001ae0.bin', is the likely payload carrier. Given the nature of RTF files, it is highly probable this was delivered via spearphishing.

Heuristics 6

Equation Editor Ole10Native payload — CVE-2017-11882 likely critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE

RTF decodes to an activated Microsoft Equation 3.0 OLE storage whose payload is a high-entropy Ole10Native stream rather than normal Equation Native/MTEF data. This is a weaponized Equation Editor RCE delivery shape consistent with CVE-2017-11882/CVE-2018-0802.
Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM

RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
\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
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_off00001ae0.bin` `4f6a3cb1a964b03e12656728d9504d11d1649b5febc81f2211cd748b386e054a`	rtf-objdata-decoded	RTF \objdata at offset 0x1AE0	145976 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.

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