RTF malware analysis — malicious · ecfaca2063655bc4

MALICIOUS

RTF

14.2 KB First seen: 2019-05-16

MD5: bde13304d9f1c0647e00e71964494585 SHA-1: a2f2a44c00e02f1d7f59fc71f559ec3093307156 SHA-256: ecfaca2063655bc41c60a6af4468f71bc962939a1dc5ec7206f208a14951d835

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 that leverages the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This exploit is designed to execute arbitrary code, likely to download and run a second-stage payload. The presence of the OLE object and the specific heuristic firings strongly indicate exploitation of this known vulnerability for client execution.

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_off000007ff.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x7FF	4155 bytes
SHA-256: `50c3f05f3628fe67c189df4b7bb628222dca4ecb24d0d6aaf25fc9867fd56ad5`

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