Emotet Office (OLE) / .XLSX malware analysis — malicious · ac3190107a7ec64d

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel

MD5: d343864d1f9cbe9f6d0f8273b1fdbc39 SHA-1: ca77c23851be69fb358de6d06e565adb6c3b88e2 SHA-256: ac3190107a7ec64d18ab535aee90450d8d61c1306353f6c1cc6191492a2837ab

240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains VBA macros, specifically a Workbook_Open auto-execution routine, which is a common delivery mechanism for Emotet. The script attempts to download and execute a second-stage payload from multiple URLs, including 'http://midnighthilivercraft.com/store/wBjNOUw/710N4cQA6R3/' and 'http://temp.com/NAT_05_22_2009/BI710N4cQA6R3/', and saves it as 'c:\programdata\oue4hjld.vbs'. It also creates a batch file 'c:\programdata\bhnasleil.bat' which likely executes the downloaded VBScript. The presence of a Workbook_Open macro and the download/execution behavior strongly indicate a downloader, consistent with Emotet.

Heuristics 6

ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
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` `48c2b2b86504a91c493c40de54a989060530e1e629a6186ca91d1d5ba0abb03f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	52433 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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