Emotet Office (OOXML) / .XLSX malware analysis — malicious · 45651ee2d1a38125

MALICIOUS

Office (OOXML) / .XLSX

92.0 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000

MD5: ff8e9b4da89eae0b929cf68120f88248 SHA-1: ac079eebdfd4cb2ebecda6e85a209ef96568f63e SHA-256: 45651ee2d1a38125b4290f1d8783e43e6535a61b14b31b42dd4ded8383ab0f8f

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is identified as malicious by ClamAV with a signature indicating it's an Emotet downloader. Static analysis reveals a Workbook_Open macro, which is a common technique for Emotet. The macro executes a series of obfuscated commands that ultimately reconstruct and execute a VBScript payload from `c:\programdata\yhjlswle.vbs`. This script is designed to download and execute a second-stage payload from one of the provided URLs.

Heuristics 5

ClamAV: Xls.Downloader.EmotetRed02221-9938910-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.EmotetRed02221-9938910-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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 project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `de7bcbc45ff0a77d05d9af662bacc316e71be11a980e94f6673e556a5dd9d1bc`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	12808 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `a12b892d9f4affecc4535def81feb18eef9169a8095352ead521ff241e9eacff`	vba-project	OOXML VBA project: xl/vbaProject.bin	37888 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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