Office (OLE) / .XLS malware analysis — malicious · cc79b6addef36d35

MALICIOUS

Office (OLE) / .XLS

168.0 KB Created: 2021-04-13 13:37:17 Authoring application: Microsoft Excel

MD5: 9d0be978f9e41f6f8d3acd8beafb7633 SHA-1: 4b82d4bf3f874f0e23219e568b251fd9c06a0517 SHA-256: cc79b6addef36d35bd0bf4f00516feb820da0eb89d1768d79c98bc82b136dcc2

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer T1204.002 Malicious File

The Workbook_Open macro executes a PowerShell command to download a second-stage payload from 'http://3.64.251.139/v11/1/TDH_1366621005IMG.exe' and save it as 'C:\Users\Public\Documents\stationdiscussion.exe'. It also attempts to establish persistence by writing to the registry key 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy' with the command 'C:\Users\Public\Documents\stationdiscussion.exe'. The script uses string concatenation to obfuscate parts of the commands and URLs.

Heuristics 4

Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
GetObject call high OLE_VBA_GETOBJ

GetObject 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 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` `e349cfbece82fff2146ae05837f3f4ce520927921535121b2d1bdf693b80a94d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1347 bytes

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