RTF / .DOC malware analysis — malicious · 61e0278a3ba7248b

MALICIOUS

RTF / .DOC

340.7 KB

MD5: 74c9d0d03b7c3ce4033754f8d3b61de2 SHA-1: 965852abf4c0a13fa909c24f1f6a41ee26c90510 SHA-256: 61e0278a3ba7248b04942441113aa92aecdd5f4f51b93d0e431048f195024971

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object, specifically related to Equation Editor and CVE-2017-11882. The ".objupdate" directive forces the activation of this embedded object, which is highly indicative of an exploit attempting to execute arbitrary code. The presence of the Equation Editor ProgID 'eQuATIoN.3' is a direct indicator of this exploit.

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 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_off00000044.bin` `63a0f790d83f070ce69e9bfd6f3806c07851d68b447fb8743c1a3fa9e035922d`	rtf-objdata-decoded	RTF \objdata at offset 0x44	174293 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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