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

Static analysis result for SHA-256 a5b29d0d62dc20f9…

MALICIOUS

Office (OLE) / .XLS

393.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-09
MD5: 93d09d597cc546ca0de452322eb66f5a SHA-1: 07bc2f7225ea8c41e2db53951b72adbd6f3d49f3 SHA-256: a5b29d0d62dc20f975768bb2c8890eebee8cb3235ac55b3da1d79e2a44ce902d
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within the Equation Editor OLE object. While the VBA macros themselves do not contain executable statements, the embedded OLE object is the primary vector for exploitation. This suggests the file is designed to execute arbitrary code upon opening, likely leading to a secondary stage download or further 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
3b155de9526a6116856d7d7d69a76979607bfc3ac59e911dba257b021ad50e49		 ole-package OLE Ole10Native stream: MBD01A61644/oLE10naTiVe 1821 bytes

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