RTF malware analysis — malicious · e2507a586e3f1b59

MALICIOUS

RTF

61.8 KB

MD5: 9cbfa24f2fe28cb7bdd96b7e1f9103fe SHA-1: 8f9149fd3fda3406143982722edaac176342f14c SHA-256: e2507a586e3f1b59d696755e600ea9d3b6f3b4c2d54d9518fabb854544075b66

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document containing OLE objects and triggering heuristics for the Equation Editor vulnerability. This indicates exploitation for client execution, likely delivered via spearphishing. The embedded OLE object and objupdate heuristic suggest the document attempts to activate the exploit, leading to payload execution.

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_off00001b37.bin` `afa681445be29266927ebfa6cab716e93e7e67a512f788d9e71b0363ccccf20a`	rtf-objdata-decoded	RTF \objdata at offset 0x1B37	2038 bytes

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