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

Static analysis result for SHA-256 35b38ca2c8ca31a4…

MALICIOUS

Office (OLE) / .XLS

1.03 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-25
MD5: e054a8f7db805e37037ba5a237f15142 SHA-1: 3225c3b941cbc466c28e6ea89b22556228ba19f7 SHA-256: 35b38ca2c8ca31a4285d57ea2e782250aeb8050ad96c8137b0b68267ba18aaa3
108 Risk Score

Malware Insights

MITRE ATT&CK
T1200 Hardware Add-Middlewares T1059.005 Visual Basic

The sample contains a critical heuristic indicating the presence of a payload exploiting CVE-2017-11882 within an Equation Editor OLE object. While the VBA macros themselves do not contain executable statements, the embedded OLE object is the primary vector for exploitation. This suggests the file is designed to leverage this known vulnerability to execute arbitrary code.

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
ed8da65f0f0a4cc2a905cfcf1ae916bf05ced375ebeefae9a837c8bf84ad6699		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3618 bytes
ole10native_00.bin
bfebacb825a0df08a1e1bb7f6804c6d26622c1ec4f6afb740f67d2974d536e3a		 ole-package OLE Ole10Native stream: MBD02CF54EA/oLe10naTIvE 1887 bytes

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