RTF / .DOC malware analysis — malicious · a6d1856378b61d3f

MALICIOUS

RTF / .DOC

504.2 KB First seen: 2022-05-24

MD5: 46803c88c7c5095b1de759fe9141dc9a SHA-1: 4e9462335d9dfceab31eae49a476b3c92fee1066 SHA-256: a6d1856378b61d3f608a1d9a611bd00cbbb6d94be1e0a4bb3533f3f89a4e0a64

182 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.003 Windows Command Shell

The sample is an RTF document that contains OLE object data. Heuristics indicate a critical vulnerability related to CVE-2017-11882, specifically involving the Equation Editor. This suggests the document is designed to exploit this vulnerability to execute arbitrary code. The presence of OLE object data and the specific CVE points to a common delivery mechanism for secondary payloads.

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.
Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
\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_off00001555.bin` `db80019737ad6fde7fcb11dd4f6a4ec1c787a0d8c25ffd5e8ad2c04e7bb9e472`	rtf-objdata-decoded	RTF \objdata at offset 0x1555	255147 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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