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

Static analysis result for SHA-256 ee82ba0e44ec6ff7…

MALICIOUS

Office (OLE) / .XLS

568.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-16
MD5: 85da2ec5c6c548b754d8ed67acdfb642 SHA-1: 9ec47a74a19598b37a855555055d7dd377c95ecc SHA-256: ee82ba0e44ec6ff78bacb7227e99659ac9808b3d1c8f914634c5a7df14eb07ed
148 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

The sample is an Excel file containing a malicious OLE object that exploits CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. This vulnerability allows for the execution of arbitrary code, typically used to download and execute a second-stage payload. No VBA macros were found to be executable, indicating the primary attack vector is the embedded 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 EAX) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EAX)
  • 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
7fd0a7b61e3e05358bc97e3753aadc94ce6de3dc81d18db6cc191873f9e6180c		 ole-package OLE Ole10Native stream: MBD000CECC1/olE10NATiVE 1296 bytes

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