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

Static analysis result for SHA-256 683ec0acbf8bde92…

MALICIOUS

Office (OLE) / .XLS

677.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2026-04-13
MD5: f04f5f10b7b5bea5354504b87b06be68 SHA-1: 6b204f282430ca61246046b6425bcf236d057e9d SHA-256: 683ec0acbf8bde9238b5def149f656a580c5f221eaa83b8704c836f8eead7d04
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded Equation Editor object, which is a known vector for exploiting CVE-2017-11882. The heuristic firings confirm the presence of this exploit. No VBA macros were found to be executable, and the document body is heavily corrupted, suggesting the primary malicious functionality relies on the Equation Editor exploit to execute a 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
76275b94722edf14fdcaa05df1d858dc4c0234d475a29ccf71326d5cf488927a		 ole-package OLE Ole10Native stream: MBD021C48AC/OLE10NAtiVE 1724 bytes

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