RTF / .DOC malware analysis — malicious · 0f929f6cc1018152

MALICIOUS

RTF / .DOC

1.83 MB

MD5: 69e521d4c121be24e8cced499d9d4e98 SHA-1: aeb9d2dcd6432645e2a7379f5b335d964d08fd39 SHA-256: 0f929f6cc1018152c6ef1db0029a8533e73e3d2f1467d684c1894a24e7a78d93

260 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains multiple indicators of exploitation for CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. The presence of OLE object data, specifically related to Equation Editor, and the ".objupdate" directive strongly suggest that the file is designed to trigger this exploit. This exploit typically leads to the execution of a second-stage payload, likely downloaded from a remote source, which is a common tactic for delivering malware.

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 ~1914KB 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_off0000111a.bin` `e01e06d90f524ac53fb8297278f29ca06bc6fe35cec08f352f7103204587227d`	rtf-objdata-decoded	RTF \objdata at offset 0x111A	957357 bytes

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