Office (OLE) / .XLS malware analysis — malicious · 9fe6a9f3d5dd9e2e

MALICIOUS

Office (OLE) / .XLS

568.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-16

MD5: 9e9d0ddb44e1add44f7ef8270b1ca482 SHA-1: c4b0e6382da8412789d1fbf78a60a12cee7d8409 SHA-256: 9fe6a9f3d5dd9e2e4a7150565463075214024aab6bc4b5290fed396f4bc3003c

108 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. The presence of an OLE object containing this exploit payload strongly suggests an attempt to achieve arbitrary code execution upon opening the document. No VBA macros were found to be executable, and the document body was unreadable, but the exploit itself is sufficient evidence of malicious intent.

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` `7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1206 bytes
`ole10native_00.bin` `f0511828a34bebb11a7bf855c557566298018caa8207115421994ee514ec4c2b`	ole-package	OLE Ole10Native stream: MBD004269F4/olE10Native	1355 bytes

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