RTF / .DOC malware analysis — malicious · 623119afef4f91cf

MALICIOUS

RTF / .DOC

163.5 KB

MD5: a24571eb4baea7a5b67480d524668617 SHA-1: 1471a4b801b065b315f130a5d512dc7597c71657 SHA-256: 623119afef4f91cf052823dd4d6b1ec9f04dc7fbe76a313035e0e4aa00888454

202 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an OLE object that leverages CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. This vulnerability is used to execute arbitrary code, likely to download and run a secondary payload. The embedded OLE object, objdata_00_off00001c0d.bin, is the primary artifact of this exploit.

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.
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_off00001c0d.bin` `7878795423745e7404772aa771ad6574d4ce543360a378717aa1565d6e1f5b6d`	rtf-objdata-decoded	RTF \objdata at offset 0x1C0D	64057 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.92, consistent with packed or encrypted content.

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