Emotet Office (OOXML) / .XLSX malware analysis — malicious · 909a0685e049348a

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 170948956a55313050b86c97c7d53f4a SHA-1: aa1445a625c6777846e06494b12c9806c991a1c8 SHA-256: 909a0685e049348a41d1c0a30b72738b3a195baccbfb7acfc6dedf83cdb36f07

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is identified as malicious by ClamAV with the signature Xls.Downloader.EmotetRed02221-9938910-0. The presence of a Workbook_Open macro indicates an attempt to automatically execute code upon opening the document. The macro appears to be designed to download and execute a second-stage payload from one of the provided URLs, such as 'http://haarehouproudcuts.com/Merch2/ARSf1LIcOauH1rDiR/', and save it as 'c:\programdata\yhjlswle.vbs'. The DOC BODY also contains obfuscated commands that likely facilitate this download and execution process.

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` `e37f35808e742d9c6e249f898fbb3f1672fd5c98a06a6a74f171b1be1246e909`	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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