RTF malware analysis — malicious · 1c2bf16c5ad8739b

MALICIOUS

RTF

457.0 KB First seen: 2019-08-04

MD5: b50faf636470945497ecb277fa338042 SHA-1: 92346a03ea2da593beb9d0ad45766724b43c19ef SHA-256: 1c2bf16c5ad8739bb77328f53651dade31be0d2a1c5e8c4f3dac6dcd51f4b449

160 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 triggers CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. This exploit allows for the execution of arbitrary code, which is highly indicative of a payload delivery mechanism. The presence of ".objupdate" and ".objautolink" further suggests that the embedded object is intended to be activated automatically upon opening the document.

Heuristics 4

CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882

Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
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_off0000174d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x174D	3621 bytes
SHA-256: `e5c11112d7953097e12ebeac1794ee174b3d6551a08b0ab2691d0ea1dca4660f`

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