RTF malware analysis — malicious · 08af14f37ae5b7ed

MALICIOUS

RTF

12.8 KB First seen: 2019-09-30

MD5: a89b8e132c1a1a85060e70416e53cbaa SHA-1: 08a991c7280d2b8fc1b1c11ed246b193e78ef154 SHA-256: 08af14f37ae5b7ed915f4892c6213e804be466c8a3ba65df7aa0ce9b8eca19ce

160 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document containing OLE object data, specifically triggering heuristics related to Microsoft Equation Editor vulnerabilities and OLE activation. This indicates the file is designed to exploit a known vulnerability (CVE-2017-11882) to achieve code execution. The presence of OLE object data suggests it's likely a malicious attachment delivered via spearphishing, intended to download and execute a further stage.

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
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.
\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_off000010cb.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x10CB	4156 bytes
SHA-256: `71283e8693204fa2f3b60c712141cd4efa0384e8fffca59d3c0b5e6b2bf068ce`

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