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

Static analysis result for SHA-256 783702a6a79df77a…

MALICIOUS

Office (OLE) / .XLS

1.42 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-10
MD5: ff5e7863a754cfa944d08fce2be782bc SHA-1: 8a8ca46f1f033ad04fdb00aab99fefd30423ac06 SHA-256: 783702a6a79df77a1f8e870a531badc8106d559588ccd7eddb3122d34d60d111
148 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE-2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a vulnerability within the Equation Editor OLE object. This technique is commonly used to execute arbitrary code, likely leading to the download and execution of a secondary payload. The presence of VBA macros, though not containing executable statements directly, suggests a potential for further obfuscation or loading of malicious content.

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 EDI) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EDI)
  • 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
1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2412 bytes
ole10native_00.bin
c76d4567921e53b8ff7f28d43b76baccc7179cd5f6fc8b14a9c24b4f4b70847e		 ole-package OLE Ole10Native stream: MBD00479393/oLE10natIve 1650 bytes

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