RTF malware analysis — malicious · 1f14a092c7493828

MALICIOUS

RTF

14.1 KB First seen: 2019-04-18

MD5: a05d2a5c81599a757b9b957fae376631 SHA-1: b94f2c02cad8a0d8f0dee00121bf857430eb0f03 SHA-256: 1f14a092c7493828f588d671ff9f48445b85c0e6a7656ee3764eaefb80ed44c4

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object that is automatically linked and updated, triggering an exploit for CVE-2017-11882. This exploit is known to deliver a secondary payload, which is likely malicious. The presence of the Ole10Native stream and the specific heuristic firing for CVE-2017-11882 strongly indicate this attack vector.

Heuristics 5

Equation Editor Ole10Native payload — CVE-2017-11882 likely critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE

RTF decodes to an activated Microsoft Equation 3.0 OLE storage whose payload is a high-entropy Ole10Native stream rather than normal Equation Native/MTEF data. This is a weaponized Equation Editor RCE delivery shape consistent with CVE-2017-11882/CVE-2018-0802.
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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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_off00000804.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x804	4146 bytes
SHA-256: `e10fac3c31a133f889245e4b55dabefd85f1356e522f32d2fb52a2a8a222d542`

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