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

Static analysis result for SHA-256 b241fcfbb88dffae…

MALICIOUS

Office (OLE) / .XLS

393.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-10
MD5: 19be150b4fcf7640951c54d7447c6e2f SHA-1: 4273a06e8cde52af71d383a3948b9b8e285457de SHA-256: b241fcfbb88dffae2a338f7e596b8df9bae738f8d1febacf630510915054d81b
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1059.005 Visual Basic

The critical heuristic firing indicates the presence of a CVE-2017-11882 exploit targeting the Equation Editor OLE object. While the VBA macros themselves contain no executable statements, the embedded OLE object is known to deliver malicious payloads. This suggests the file is designed to exploit this specific vulnerability for initial compromise.

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
add6e3b033e6df211cd0adfbdce1a2d9adeef04695357777f2bc3a92f6ec283b		 ole-package OLE Ole10Native stream: MBD01AAE5AA/Ole10NaTivE 1820 bytes

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