RTF malware analysis — malicious · b889e8917def6b5d

MALICIOUS

RTF

8.1 KB First seen: 2020-04-06

MD5: a4cc5ff6d73f2117087bbc378249cc25 SHA-1: ccf16dfb5c7566de6072cb7c6cdd67c80cba945b SHA-256: b889e8917def6b5de4df6c051bfe53bec690465727d1b43dc3c33af150f33051

180 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document containing an embedded OLE object, specifically triggering heuristics related to the Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for arbitrary code execution when the object is activated. The presence of ".objupdate" further indicates an attempt to force OLE activation. The file is identified by ClamAV as Doc.Exploit.CVE_2017_11882-6934206-0, confirming the exploit attempt.

Heuristics 4

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
\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_off0000003a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3A	4137 bytes
SHA-256: `76ecf139eac09e8d93dcd8514580e95cb05919178047534804e02835453890e9`

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