Office (OLE) / .XLS malware analysis — malicious · 7120308692d2e711

MALICIOUS

Office (OLE) / .XLS

134.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: 4029a690a0fc30078612d66640ba528c SHA-1: 39649a27e5511b77cd10374ec2cbe3cdf4d5ae21 SHA-256: 7120308692d2e71147ed246ed33ac3cd814ca38ec9c604d25a5a61adfdef33f8

220 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The file is an Excel spreadsheet containing VBA macros, including an Auto_Open subroutine. Critical heuristics indicate obfuscated API calls, specifically reassembling the string 'URLDownloadToFile'. This strongly suggests the macro's purpose is to download and execute a second-stage payload from a remote source. The ClamAV detection name further supports this, identifying it as a downloader.

Heuristics 5

Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION

VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
ClamAV: Doc.Downloader.Docusign112100-9908075-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Docusign112100-9908075-0
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
Auto_Close macro high OLE_VBA_AUTOCLOSE

Auto_Close macro
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `b7388804061497f168633a436d67a41b41f67d332432ab9017039fff0030875c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	4998 bytes

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