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

Static analysis result for SHA-256 a43a3e76f9ba516e…

MALICIOUS

Office (OLE) / .XLS

87.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-01-19
MD5: e2d1ff6b712a860d8d391cefbb43f3c7 SHA-1: 254b5f2fbb81e0dd02f503d23eac17a0b7419717 SHA-256: a43a3e76f9ba516e32fecdbabdc602eb4901ae5a7ff433c097944f38796512d4
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 PowerShell

The sample is an Excel file containing an embedded Equation Editor object, which is a known vector for exploiting the CVE-2017-11882 vulnerability. This vulnerability allows for arbitrary code execution. No VBA macros were found to be executable, and no document body was extracted, but the presence of the vulnerable OLE object is sufficient evidence for exploitation.

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
f270a3e67ea2463a275bde84f9d5bb9ab95a614de223c7608039c8eb8d3b2c6a		 ole-package OLE Ole10Native stream: MBD025AF9F8/Ole10NatIVE 1718 bytes

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