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

Static analysis result for SHA-256 c4647cb1eacba628…

MALICIOUS

Office (OLE) / .XLS

158.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-05-29
MD5: b8d9f8d65c19f6cbe0ec043200f9e377 SHA-1: 0b83cb4b67e4af47636b6b25d8286a330cba3e87 SHA-256: c4647cb1eacba6281228502443db52aaba6397267164221359cb57cabf55c10f
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample contains an embedded Equation Editor OLE object that is known to be vulnerable to CVE-2017-11882. This vulnerability allows for the execution of arbitrary code, indicating the file is designed to exploit this flaw to deliver a secondary payload. No VBA macros were found to be executable, and the document body is minimal, making the Equation Editor exploit the primary indicator of malicious intent.

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
f8ca03cf78711f8593205c2806083a4288bb1a15c0cd7d0f0242b1d14047443e		 ole-package OLE Ole10Native stream: MBD01BAEA62/olE10NaTive 1898 bytes

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