RTF malware analysis — malicious · bd2bb76d2426ff52

MALICIOUS

RTF

26.4 KB First seen: 2023-06-11

MD5: ef5538a4f8523b8087a46a4f0319a2ff SHA-1: aab2a3d4b1de0e0f800d9a1648fcb409bb1c8e5e SHA-256: bd2bb76d2426ff52e316859b830fcdf7a55d78b789345f27834422266866f98d

140 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell

The sample is an RTF document containing an embedded OLE object, specifically targeting the Equation Editor vulnerability (RTF_EQUATION_EDITOR). The presence of \objupdate indicates an attempt to force OLE activation, likely to trigger the exploit. This exploit is known to download and execute a second-stage payload, hence the high confidence in an exploitation-based attack pattern.

Heuristics 4

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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000162b.bin` `5f1dea11fff4f6720cdebb279801a8d1dc2715f3c5bfd8998d9bdbf3c6a6cd68`	rtf-objdata-decoded	RTF \objdata at offset 0x162B	4183 bytes

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