RTF malware analysis — malicious · 87ef9627f44fa8a1

MALICIOUS

RTF

213.4 KB First seen: 2019-04-18

MD5: 18b86a02371d62bf92cffd8af8e0d6e6 SHA-1: a3670cc46bc46f1a943dcda3d2f9f00e22fc917a SHA-256: 87ef9627f44fa8a150350475e02ebde1e417fe1ac37f516e5335a639ac023160

180 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object with data indicative of the CVE-2017-11882 Equation Editor vulnerability. This exploit is known to allow for arbitrary code execution, which is likely used here to download and run a subsequent stage. No specific family could be identified, but the exploit method is clear.

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.
\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_off0000003b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3B	45753 bytes
SHA-256: `14211ebbb5c83a4512b35306386e2b2185d69c691a5810641e0988d1ab2de253`

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