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

Static analysis result for SHA-256 1f236f34f605e821…

MALICIOUS

Office (OLE) / .XLS

209.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-05-15
MD5: eea5996c74cfe674abfd0db6c12add5d SHA-1: e5d16ea815bd1fcb6ed453dbeeaebbc4aadc77e3 SHA-256: 1f236f34f605e82185e109716821ba04e911fcb46542daed4886abbd90e3c7c9
148 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing a malicious Equation Editor OLE object, specifically leveraging the CVE-2017-11882 vulnerability. This vulnerability allows for arbitrary code execution when the Equation Editor is loaded. 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 EBX) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EBX)
  • 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
f68612443ed2df17a5c6256e1864b806cf1fe16fb8ab20292f89cfb244af7956		 ole-package OLE Ole10Native stream: MBD01500887/OLe10naTIVe 1810 bytes

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