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

Static analysis result for SHA-256 f3052b577ec80fdf…

MALICIOUS

Office (OLE) / .XLS

186.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-03-10
MD5: 5e5e7c1a0fdf9fec7bfe297e3fd2daa8 SHA-1: 2033890a94f4dee942f16a08f99f47394ef454df SHA-256: f3052b577ec80fdf6cc746e26dd70823537d23f9e9f38520e161b73c17a2b722
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded Equation Editor OLE object. Heuristics indicate the presence of a payload exploiting CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution when the malicious object is processed, likely leading to the download and execution of a second-stage payload.

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
eeb6c1b49def5ccf88c25f9aef9545c7998ae14a7afaacd80aa94bb8b889307a		 ole-package OLE Ole10Native stream: MBD00023AF5/olE10NATIve 1447 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.