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

Static analysis result for SHA-256 faab8b743688c417…

MALICIOUS

Office (OLE) / .XLS

393.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-09
MD5: 5d3668bf4e128d9c01e35bff71da889f SHA-1: bac96034cc103ff4da73e80c0e7c179471d7ae13 SHA-256: faab8b743688c41771aafcac425758a97a3b79eaab9937ebb86cb291462a1fb9
148 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. This is further supported by the presence of an OLE object containing Equation Editor payload. The VBA macros are present but do not contain executable statements, suggesting the exploit is directly within the OLE object.

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
e425ddb0632ac1d1f89e4db20ba05266f63253c07de0001ee8dfa22fd9720b06		 ole-package OLE Ole10Native stream: MBD01AB0F98/Ole10naTive 1583 bytes

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