RTF malware analysis — malicious · 022c6e2a26788b54

MALICIOUS

RTF

8.2 KB First seen: 2018-08-14

MD5: e95bdb0bc8cfe1f12d5178d23b697d2b SHA-1: fe64187ff906dda545fe1236ece26f81027659c0 SHA-256: 022c6e2a26788b547d6605bc0f9f36165d790ac1abc24a803a588acc5b85372c

220 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data and triggers heuristics related to Equation Editor exploits, specifically CVE-2017-11882. The presence of ".objupdate" further indicates an attempt to activate the embedded OLE object, leading to the execution of malicious code. The ClamAV detection confirms this exploit.

Heuristics 5

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
Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM

RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
\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_off0000003c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3C	4157 bytes
SHA-256: `0b291d00855a8362f564a4874cb0bcb2289e568916ec463f19486fee49fed9bd`

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