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

Static analysis result for SHA-256 e2f89f686e9d970e…

MALICIOUS

Office (OLE) / .XLS

1.08 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-30
MD5: ca21cd02bc4578ff70404d6d97d0b80c SHA-1: ac5c9356aae2552c4962562932e7b258f91c826a SHA-256: e2f89f686e9d970ef29ffccbb58ad80649d7489a776e212d142016283896900d
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in the Equation Editor component. This suggests the file is designed to execute arbitrary code upon opening, likely to download and run a secondary payload. No VBA macros were found to contain executable statements, and the document body was unreadable.

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
f8c1ce70b4ac403ea59c243020fbcf1beb8bde1513740fbfe4cd364d0ed9d749		 ole-package OLE Ole10Native stream: MBD01C4A774/oLe10naTIVe 2080 bytes

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