Office (OLE) / .XLS malware analysis — malicious · 2f38b9fa0f4a2ddd

MALICIOUS

Office (OLE) / .XLS

1.54 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-06

MD5: 42664917b5697bd6763575f637964dd7 SHA-1: 3c12a69526631e72173cbd8d3f2f491806686a0a SHA-256: 2f38b9fa0f4a2ddd44fea522407a096d386ea4c4934bd954336ffef33ec45d8c

108 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.005 PowerShell

The critical heuristic firing indicates the presence of a CVE-2017-11882 exploit targeting Microsoft Equation Editor. This vulnerability allows for arbitrary code execution when the OLE object is processed. While the VBA macros themselves appear empty, the embedded OLE object is the primary vector for exploitation. The file's SHA256 hash is included as an IOC.

Heuristics 3

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.
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.

Filename	Kind	Source	Size
`macros.bas` `1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2412 bytes
`ole10native_00.bin` `12f53c21728a610da6490056cb39359e172548533d1fa23b03c352a58e4c7178`	ole-package	OLE Ole10Native stream: MBD00E0A137/Ole10Native	1941 bytes

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