Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 193fe8c9f0b3ba4a…

MALICIOUS

Office (OLE) / .XLS

209.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-07-04
MD5: 36c189f80d7ea1d308f10ecc0091c1c2 SHA-1: a789b6fdb3c1361aa29213ee05cf21c5644f5d28 SHA-256: 193fe8c9f0b3ba4a43ae50b0217407410e29c0d2939396433f3bfaaa062ca3cf
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 Visual Basic

The sample contains an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution when the object is processed. No VBA macros were found to be executable, and the document body is minimal, indicating the primary attack vector is the Equation Editor exploit.

Heuristics 3

  • Equation Editor Ole10Native payload — CVE-2017-11882 critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE
    An embedded Microsoft Equation 3.0 object (CLSID 0002CE02-0000-0000-C000-000000000046) carries an Ole10Native packager stream instead of the normal Equation Native/MTEF data. This is the weaponized Equation Editor RCE delivery shape used by CVE-2017-11882 / CVE-2018-0802 maldocs. The payload (font-record overflow + shellcode) is frequently encrypted and the stream name case-scrambled to evade scanners, but an Equation object holding an Ole10Native stream has no benign use.
  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Contains Equation Editor object — related to CVE-2017-11882 / CVE-2018-0802 exploitation, but CLSID presence alone is not the malformed MTEF exploit primitive.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
fe774c5c23a2094f12cb1782d7e0936e3bb7dc286518253e62cc0140cab89782		 ole-package OLE Ole10Native stream: MBD0005706C/oLE10natIve 1451 bytes

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