RTF / .DOC malware analysis — malicious · d974ed000ae7e6a5

MALICIOUS

RTF / .DOC

500.9 KB First seen: 2021-11-03

MD5: 79e75f01e71f203f6ee6422f0721db5b SHA-1: e4df174cf3805c7ad6295d4f6054d270303a4466 SHA-256: d974ed000ae7e6a5183a143f8b8874bc8f61061526ce8c4f88ef33f922b1ff28

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains embedded OLE object data and triggers OLE activation via \objupdate, strongly indicating an attempt to exploit a vulnerability. The presence of the Equation Editor CLSID points to a known exploit vector, likely CVE-2017-11882, which allows for arbitrary code execution. No scripts were extracted, but the structure suggests a classic exploit delivery mechanism.

Heuristics 5

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.
Equation Editor CLSID critical RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
\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
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_off0000091f.bin` `4a39db3e6c6dbf968856d75313a183ab1e7d587b4b1b5a443852604df7bc0c3f`	rtf-objdata-decoded	RTF \objdata at offset 0x91F	145984 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.97, consistent with packed or encrypted content.

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