RTF / .DOC malware analysis — malicious · 6f0796961cca408d

MALICIOUS

RTF / .DOC

2.00 MB First seen: 2022-03-15

MD5: 080ef112486d73193ede27db1934ceaa SHA-1: c35f25b343800edddaeeb00b7af5eb8d01d40fec SHA-256: 6f0796961cca408d82b8b08b0f39dc118d6678c6c82b667778e5e92034e27ca8

260 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an RTF document that contains embedded OLE object data, specifically related to Equation Editor. Critical heuristics indicate the exploitation of CVE-2017-11882, a known vulnerability that allows for arbitrary code execution. This vulnerability is typically leveraged to download and execute a secondary payload, suggesting a malicious intent to compromise the user's system.

Heuristics 6

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.
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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~2089KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001377.bin` `bedacd45d0d81aef3ba1120d93a8116c57bc6f2a89fa0581ddf2ed9889a3c70b`	rtf-objdata-decoded	RTF \objdata at offset 0x1377	1044914 bytes

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