RTF / .DOC malware analysis — malicious · 4dbd40977dbbf43e

MALICIOUS

RTF / .DOC

9.2 KB First seen: 2022-07-25

MD5: 69274fcab5990891d563155a7d73ee19 SHA-1: 7abc11ddcdc4b5556fb03b9e0068e57821bdef21 SHA-256: 4dbd40977dbbf43e6f55b970d6de97588d61cd3361d8b177b3c30a74c7354fc1

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059 Command and Scripting Interpreter

The sample is an RTF document that contains an embedded OLE object. Heuristics indicate a critical vulnerability, CVE-2017-11882, related to the Equation Editor component. This vulnerability is known to allow for arbitrary code execution when the embedded object is activated, typically leading to the download and execution of a second-stage malware. The RTF_OBJUPDATE heuristic further suggests that the embedded object is configured to automatically activate.

Heuristics 4

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
\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_off0000003e.bin` `0ef93f7a66436a2400a8f1a1c17e2e9e8255a82904b0e0bfda9337cdad7bb8ce`	rtf-objdata-decoded	RTF \objdata at offset 0x3E	4658 bytes

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