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

Static analysis result for SHA-256 dd486fc5310b5471…

MALICIOUS

Office (OLE) / .XLS

209.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-05-17
MD5: 55de05e0c7da8de430ff6d99f1c895ce SHA-1: a86c0a27b484dd0965af983d1514e4576d5a8df0 SHA-256: dd486fc5310b5471d7214b795427a6abd008076050f56cb4a6c3b9772d1a2de3
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing a malicious OLE object that exploits CVE-2017-11882 in the Equation Editor. This vulnerability allows for arbitrary code execution, indicating the file's purpose is to deliver a secondary payload. No VBA macros were found to be executable, but the OLE object itself is the primary attack vector.

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
c70cfa02d85f8487d74a7394ce747b1a991fad2822fd2e845a226adebe787a83		 ole-package OLE Ole10Native stream: MBD01F51406/oLe10nAtiVE 1508 bytes

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