Emotet Office (OLE) / .XLSX malware analysis — malicious · c81bb0c189658e7e

MALICIOUS

Office (OLE) / .XLSX

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

MD5: d1be7a0a9f9919a92ae35b3a2bc18acd SHA-1: 2ba50132ba5f9ce49c184d05e45f74cb2916a964 SHA-256: c81bb0c189658e7e1a6a6bbe5fdecb9355618dd98e235b8f3f3bec187ba51d82

240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The critical ClamAV detection and high-severity heuristics for VBA macros, Workbook_Open execution, and CreateObject calls strongly indicate a malicious document. The VBA script contains obfuscated commands that reconstruct the following URLs for payload download: 'http://midnigthsilvercrafters.com/store/wBjNOUwc/BI710N4cQA6R3/', 'http://temporal.com/NAT_E_05_22_2009/BI710N4cQA6R3/', and 'https://redington.karmaat'. It also attempts to drop executables to 'c:\programdata\oue4hjld.vbs' and 'c:\programdata\bhnasleil.bat', likely to download and execute a second-stage payload. The Workbook_Open auto-execution further confirms the intent to run malicious code upon opening the document.

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` `fcbbcf1b857b52949b7b96ab90780081b6a9012da6c7cb626c72fb7eb3eda95a`	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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