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

Static analysis result for SHA-256 10874ca78cb93ab5…

MALICIOUS

Office (OLE) / .XLS

185.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-03-15
MD5: bf01be6642047f19baedc920de1eaddb SHA-1: 5d938483f552083e663b6c7957dc9a0a9f15c14e SHA-256: 10874ca78cb93ab513055d9d4960dc21e4aa4f6b9eeb5d466e8fe7fe51553963
148 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded Equation Editor OLE object. Heuristics indicate this object exploits CVE-2017-11882, a known vulnerability in Microsoft Equation Editor, to execute arbitrary code. No VBA macros were found to be executable, suggesting the primary attack vector is the Equation Editor vulnerability itself. The file's SHA256 hash is provided as an IOC.

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 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.

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
85b6baa0e7f81879f7dcb372b6d999a5070fc76c736a172c20b974425b4caf7a		 ole-package OLE Ole10Native stream: MBD011FB8A4/OlE10NATiVe 1429 bytes

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