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

Static analysis result for SHA-256 493119c2caf898cd…

MALICIOUS

Office (OLE) / .XLS

1.42 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-10
MD5: c2cde165d9299f03a15c44ae27573ae9 SHA-1: 4930a00f6e1ab9dcf225dc9895e8a5f312775b3b SHA-256: 493119c2caf898cdee17932a4f67d5944212116cf348499c4c1dcc6f6d48e5ac
148 Risk Score

Malware Insights

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

The sample is an Excel file containing a malicious Equation Editor OLE object, which is a known exploit for CVE-2017-11882. This vulnerability allows for arbitrary code execution when the document is opened. No VBA macros were found to be executable, but the presence of the exploit object is sufficient for malicious execution.

Heuristics 4

  • 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.
  • x86 GetPC stub (CALL $+5; POP EDX) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EDX)
  • 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
be68950ea439673e7ed773e2ca3071ecdd7e2a63a6374e2e746db300e8aec725		 ole-package OLE Ole10Native stream: MBD00415A6F/oLE10naTIve 2035 bytes

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