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

Static analysis result for SHA-256 e453a082fa39436d…

MALICIOUS

Office (OLE) / .XLS

535.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-04
MD5: 967994adfd944c50f3d24fcf817fd160 SHA-1: ff711c1b0dca4a159f795f55d96a18f9ff6f5b25 SHA-256: e453a082fa39436dc43399640eabd0daa5b7de7f3675986890d66da797611e25
108 Risk Score

Malware Insights

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

The critical heuristic firing for CVE-2017-11882 indicates that the sample contains a payload designed to exploit this vulnerability within the Equation Editor OLE object. While no VBA macros were found to contain executable statements, the presence of the exploit payload strongly suggests an attempt to achieve arbitrary code execution. The file is an Excel spreadsheet, a common delivery mechanism for such exploits.

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
b5a1f3294dda09f0ae102250bc4277b698110162ccf3fbb4c2201c087a73ff4e		 ole-package OLE Ole10Native stream: MBD002F6F95/OLe10NatiVE 1247 bytes

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