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

Static analysis result for SHA-256 18581c304ce66ac9…

MALICIOUS

Office (OLE) / .XLS

1.43 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-15
MD5: bf98313e3a2186738d79554ecce2338f SHA-1: 2ecfe666572e32b2c9771d64a1b7700fab5a03f9 SHA-256: 18581c304ce66ac9794d4844c8026bb8ed1e9474b20d8cbc217f7e1b2aa7f499
168 Risk Score

Malware Insights

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

The file contains a critical heuristic indicating exploitation of CVE-2017-11882 via the Equation Editor OLE object. This vulnerability is known to be used for initial execution. No VBA macros were found to be executable, and no document body was extracted, but the presence of the Equation Editor exploit is sufficient evidence of malicious intent. The ClamAV detection name suggests a downloader.

Heuristics 4

  • 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.
  • ClamAV: Xls.Downloader.94c25b356b5a6cac-9978798-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.94c25b356b5a6cac-9978798-0
  • 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
b0dac2ba377b11440241ce908c92d28c0b408adf8155f5af61973ee944e0265c		 ole-package OLE Ole10Native stream: MBD0156F50F/OlE10natIVe 1946 bytes

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