Emotet Office (OLE) / .XLSX malware analysis — malicious · 9450fd5f477fe3db

MALICIOUS

Office (OLE) / .XLSX

129.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: 44b32047dcb344a1ab93098c4b20318b SHA-1: e8c25ba7379353b7a91c9570d1dd779ed852794a SHA-256: 9450fd5f477fe3db0738e2c4adaa577b84b58d69484847cb5ad3589de46b46f1

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command and Shell T1204.002 Malicious File

The file contains VBA macros that execute upon opening, as indicated by the Workbook_Open heuristic. The script leverages `CreateObject` to instantiate `Wscript.Shell`, which is then used to execute a batch file and a VBScript. The VBScript appears to be heavily obfuscated but reconstructs several URLs that are likely used to download a second-stage payload. The ClamAV detection name 'Doc.Downloader.EmotetRed02220-9938909-0' strongly suggests an Emotet family attribution. The reconstructed URLs and the dropped files `c:\programdata\yhjlswle.vbs` and `c:\programdata\ughldskbhn.bat` are high-priority IOCs.

Heuristics 7

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

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
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` `7a075e02dc1e88807280b9b84946715e79a3c091d50391301434649c77b78ea1`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12808 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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