RTF / .DOC malware analysis — malicious · ea13d9b4eeb50863

MALICIOUS

RTF / .DOC

8.2 KB

MD5: e73c023c85349202dc11653d381fbca8 SHA-1: 897bce437c44ee5aca116e198b1b7a3d73995674 SHA-256: ea13d9b4eeb50863243709393c454bb05040360e23978ae94530b5b0063ac09f

220 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter T1071.001 Application Layer Compromise T1566.001 Phishing: Spearphishing Attachment T1071.002 Application Layer Attack T1195 Exploit Public-Facing Application

The file exhibits multiple indicators of an Equation Editor exploit, primarily through the presence of the Equation Editor CLSID and the CVE-2017-11882 heuristic. The use of extit{objdata}, extit{objautlink}, and extit{objupdate} controls further strengthens this assessment. The extit{objupdate} control word is a key indicator of Equation Editor exploits, forcing immediate OLE object instantiation upon document opening, bypassing user interaction. The file likely attempts to download and execute a secondary payload via a mechanism triggered by the Equation Editor vulnerability. The high confidence reflects the well-documented nature of this exploit and the clear evidence of its presence within the sample.

Heuristics 5

CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882

Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
Equation Editor CLSID critical RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
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.
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000041.bin` `c3f417e10a4922caebb1fb7fd05f2afbdb89d18dc14ab3cd579551b68edec88e`	rtf-objdata-decoded	RTF \objdata at offset 0x41	4136 bytes

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