RTF / .DOC malware analysis — malicious · 864a6c6e46e71b2f

MALICIOUS

RTF / .DOC

29.9 KB First seen: 2021-07-10

MD5: 89920944ede2bbdce971d56233500838 SHA-1: b427c970867a05a5656923c87f4be49c38f15e93 SHA-256: 864a6c6e46e71b2f997f4280151123c4e7f929f530d5704b8e7112a71242dda3

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains embedded OLE object data and triggers an ".objupdate" command, indicating exploitation of the Equation Editor vulnerability (CVE-2017-11882). This technique is commonly used to download and execute a second-stage payload, leading to a malicious infection.

Heuristics 3

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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000824.bin` `bced26305bad9db87b83e3d3bbeaa3726412f985179bcb39befca201f1dae2ea`	rtf-objdata-decoded	RTF \objdata at offset 0x824	1472 bytes

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