Malicious RTF — malware analysis report

Static analysis result for SHA-256 889f24ccf96f2440…

MALICIOUS

RTF

80.1 KB
MD5: 6fd44068f00de9e91faab3ee35e9cbd2 SHA-1: 4f1f89506269505b8f32e1302b3f7a5565363a9b SHA-256: 889f24ccf96f2440099f4d5795477bdef34588b6a67f59fd1c937429087b3ae3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains an embedded OLE object that leverages a known vulnerability in the Equation Editor (CVE-2017-11882). This vulnerability allows for the exploitation of a font record overflow, leading to arbitrary code execution on the victim's machine. The specific exploit details suggest a critical vulnerability that is likely used to download and execute a secondary payload.

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.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • 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.

FilenameKindSourceSize
objdata_00_off00002336.bin
9f1fcc96d3271029f829b2980c8c74aca7b8a48dda73961c41a53968cd7fbd4f		 rtf-objdata-decoded RTF \objdata at offset 0x2336 3631 bytes

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