Emotet Office (OLE) / .XLSX malware analysis — malicious · 2c90bc1e80f13da5

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 7ac72e5214d1bb39c0334ebc93ab56db SHA-1: 4a99d40eb7f9d9fef9dacbede97a9cfb1768653d SHA-256: 2c90bc1e80f13da59a5d2498c08fa3363cd45919a5a34799891fab59594f8e5c

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is identified as malicious by ClamAV with the signature 'Doc.Downloader.EmotetExcel02226-9938630-0', indicating a known Emotet variant. The presence of a Workbook_Open macro that uses CreateObject to execute Windows Script Host and a batch file (`c:\programdata\jledshf.bat`) strongly suggests a downloader functionality. The batch file contains obfuscated commands and a Base64 encoded string which decodes to multiple URLs, likely for downloading a second-stage payload. The VBA code also attempts to reconstruct a URL from concatenated strings, which is a common Emotet technique.

Heuristics 7

ClamAV: Doc.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
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` `006c4f4d54d1c9bb906763adb0bd849cdbbe9d88f3fa78ad2d18ef6987f96c37`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	8906 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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