Office (OLE) / .XLS malware analysis — malicious · 9d8e85e69f4a4cba

MALICIOUS

Office (OLE) / .XLS

58.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-22

MD5: 620568d2a3aedd40092115c1525541e8 SHA-1: 56ac6a669338118f1b42ee2b6b0e67fc1166c052 SHA-256: 9d8e85e69f4a4cbacc405332d612f0347d8beed08adc3681ddd5e459ca8726a2

148 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: Malicious Attachment

The sample is an Excel file containing an embedded Equation Editor OLE object that exploits CVE-2017-11882. This vulnerability allows for the execution of arbitrary code, typically used to download and run a second-stage payload. No VBA code was found to be executable, but the presence of the exploit is sufficient for malicious intent.

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.

Filename	Kind	Source	Size
`macros.bas` `7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1206 bytes
`ole10native_00.bin` `527c913496659a5f957ed2c3e1c6f61c0903801d4caef846ec48415d6e02cada`	ole-package	OLE Ole10Native stream: MBD0107403B/Ole10nATiVE	2006 bytes

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