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

Static analysis result for SHA-256 fc73ecd3478a0644…

MALICIOUS

Office (OLE) / .XLS

1.07 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-01-10
MD5: 5531f1b0a51ec002f27b542b5921ced6 SHA-1: 95ec17fd36b85a3635384e1bb6e9f61d8f878657 SHA-256: fc73ecd3478a064482d3627a82e6296b87e8475d2cdba000ded33ce1025110b6
150 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates that the sample exploits a known vulnerability in Microsoft Equation Editor. The presence of an embedded OLE object containing a payload further supports this. No VBA macros were found to be executable, and no external URLs were identified as malicious, suggesting the exploit itself is the primary delivery mechanism. The sample is likely a dropper for a second-stage payload.

Heuristics 5

  • 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 ESI) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP ESI)
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 4

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
49211c49e92e783a29bd20e4981ba551e3b0a9771c40ab3d7903ea2693f95cc5		 ole-package OLE Ole10Native stream: MBD0A8B8323/Ole10Native 30803 bytes
ole10native_03.bin
f81b5dc0f134bff67b32850863689811e3ff1dad6ed5cd918403c20cc4d6ab1e		 ole-package OLE Ole10Native stream: MBD0A8B8328/Ole10Native 30803 bytes
ole10native_04.bin
6bcf13bbfab4d5852b11ed390869c80634adfd5959825dbc7b114b2f7b84ad1c		 ole-package OLE Ole10Native stream: MBD0A8B832B/ole10NATIvE 1864 bytes

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