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

Static analysis result for SHA-256 318266f6b10d0e63…

MALICIOUS

Office (OLE) / .XLS

397.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-10
MD5: f9cb4fc4bd24576b169b8cb103cf9d01 SHA-1: f7b4e9bb156d21398644b03ed5d67b1b0561407b SHA-256: 318266f6b10d0e63fa6419e4d11827baeef8b2b851c0c39ec7ca2f5a08dbf88b
108 Risk Score

Malware Insights

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

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates that the file contains a payload exploiting this known vulnerability. The presence of an OLE object related to Equation Editor further supports this. No VBA macros were found to be executable, and the document body was not parsable, suggesting the exploit is the primary mechanism for payload delivery.

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
c027329ec4a34c75b4a4650b6b4ef553b2192e1564fd0827ce769ecfd97fd6b1		 ole-package OLE Ole10Native stream: MBD01FE5F93/OlE10nATIvE 1400 bytes

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