RTF / .DOC malware analysis — malicious · acb2b92c42fe35d1

MALICIOUS

RTF / .DOC

117.9 KB

MD5: 95c0072619a60041c1fe3072a9d5bb45 SHA-1: 490295f03e79afc6a4a82ae3983b150ef9c18055 SHA-256: acb2b92c42fe35d16b98b26b2db43f7f944ce1dd160f60a00041f1359268a26d

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an OLE object with data indicative of the CVE-2017-11882 Equation Editor vulnerability. The presence of \objdata and \objupdate directives strongly suggests that the embedded object is designed to be activated automatically upon opening the document, leading to the execution of arbitrary code. No document body text or scripts were extracted, but the exploit itself is clearly indicated by the heuristics.

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_off0000005e.bin` `c401c829ce89e195702f01716e3dd47894b03cfb155666e0ef1e92c9113ae70f`	rtf-objdata-decoded	RTF \objdata at offset 0x5E	60238 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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