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

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Summary | ZeroBOX

rep-1051031759.xls

Downloader MSOffice File

Category	Machine	Started	Completed
FILE	s1_win7_x6403_us	Nov. 12, 2021, 10:40 a.m.	Nov. 12, 2021, 10:46 a.m.

Size	231.5KB
Type	Composite Document File V2 Document, Little Endian, Os: Windows, Version 10.0, Code page: 1251, Name of Creating Application: Microsoft Excel, Create Time/Date: Fri Jun 5 18:19:34 2015, Last Saved Time/Date: Thu Nov 11 08:08:43 2021, Security: 0
MD5	`91bf161ba415880db9f4bdc5eea1500b`
SHA256	`371b9a5561ce861a598f19b908b8e7cc895c6f4a3cc5a7ef8dbd5cb7da2f240e`
CRC32	`91F78F10`
ssdeep	`6144:pKpb8rGYrMPe3q7Q0XV5xtuEsi8/dgAcfFw6lxFT7kFWqOSMQ6HujLmH98DUZ:iFrlxFTMrvbiFd8Di`
Yara	Microsoft_Office_File_Downloader_Zero - Microsoft Office File Downloader Microsoft_Office_File_Zero - Microsoft Office File

EXCEL.EXE "C:\Program Files (x86)\Microsoft Office\Office15\EXCEL.EXE" C:\Users\test22\AppData\Local\Temp\rep-1051031759.xls
2336
- regsvr32.exe "C:\Windows\System32\regsvr32.exe" C:\Datop\good.good
  2548
- regsvr32.exe "C:\Windows\System32\regsvr32.exe" C:\Datop\good1.good
  2588
- regsvr32.exe "C:\Windows\System32\regsvr32.exe" C:\Datop\good2.good
  2632

Name	Response	Post-Analysis Lookup
ggeletric.com.br	A 162.241.203.46	162.241.203.46
centroespanolperu.net.pe	A 198.38.91.247	198.38.91.247

IP Address	Status	Action
162.241.203.46	Active	Moloch
164.124.101.2	Active	Moloch
198.38.91.247	Active	Moloch

Suricata Alerts

Flow	SID	Signature	Category
TCP 192.168.56.103:49164 -> 198.38.91.247:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 192.168.56.103:49167 -> 162.241.203.46:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 198.38.91.247:443 -> 192.168.56.103:49165	2029340	ET INFO TLS Handshake Failure	Potentially Bad Traffic
TCP 162.241.203.46:443 -> 192.168.56.103:49169	2029340	ET INFO TLS Handshake Failure	Potentially Bad Traffic
TCP 192.168.56.103:49171 -> 162.241.203.46:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 162.241.203.46:443 -> 192.168.56.103:49173	2029340	ET INFO TLS Handshake Failure	Potentially Bad Traffic
TCP 192.168.56.103:49172 -> 162.241.203.46:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 192.168.56.103:49163 -> 198.38.91.247:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 192.168.56.103:49168 -> 162.241.203.46:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined

Suricata TLS

No Suricata TLS

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

Time & API	Arguments	Status	Return	Repeated
NtProtectVirtualMemory Nov. 12, 2021, 10:40 a.m.	process_identifier: 2336 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x6bd28000 process_handle: 0xffffffff	1	0	0
NtProtectVirtualMemory Nov. 12, 2021, 10:40 a.m.	process_identifier: 2336 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x6b072000 process_handle: 0xffffffff	1	0	0
NtProtectVirtualMemory Nov. 12, 2021, 10:40 a.m.	process_identifier: 2548 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x6c201000 process_handle: 0xffffffff	1	0	0
NtProtectVirtualMemory Nov. 12, 2021, 10:40 a.m.	process_identifier: 2588 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x6c201000 process_handle: 0xffffffff	1	0	0
NtProtectVirtualMemory Nov. 12, 2021, 10:40 a.m.	process_identifier: 2632 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x6c201000 process_handle: 0xffffffff	1	0	0

Creates a suspicious process (6 events)

cmdline	regsvr32 C:\Datop\good.good
cmdline	"C:\Windows\System32\regsvr32.exe" C:\Datop\good1.good
cmdline	"C:\Windows\System32\regsvr32.exe" C:\Datop\good.good
cmdline	regsvr32 C:\Datop\good1.good
cmdline	"C:\Windows\System32\regsvr32.exe" C:\Datop\good2.good
cmdline	regsvr32 C:\Datop\good2.good

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 Nov. 12, 2021, 10:40 a.m.	process_identifier: 2336 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

File has been identified by 10 AntiVirus engines on VirusTotal as malicious (10 events)

McAfee	X97M/Downloader.mf
Cyren	XF/Agent.AI.gen!Camelot
ClamAV	Xls.Downloader.Qbot1120211-9905990-0
Kaspersky	HEUR:Trojan.MSOffice.Generic
McAfee-GW-Edition	X97M/Downloader.mf
Sophos	Mal/DocDl-M
Tencent	Trojan.MsOffice.Macro40.11014080
Ikarus	Trojan-Downloader.XLM.Agent
Fortinet	XF/CoinMiner.Z!tr
AVG	XLS:Nastya [Trj]

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 Nov. 12, 2021, 10:40 a.m.	url: https://centroespanolperu.net.pe/Yshqq3cSzufu/ui.html stack_pivoted: 0 filepath_r: C:\Datop\good.good filepath: C:\Datop\good.good		2148270085	0
URLDownloadToFileW Nov. 12, 2021, 10:40 a.m.	url: https://ggeletric.com.br/W1MYKeq0i5/ui.html stack_pivoted: 0 filepath_r: C:\Datop\good1.good filepath: C:\Datop\good1.good		2148270085	0
URLDownloadToFileW Nov. 12, 2021, 10:40 a.m.	url: https://ggeletric.com.br/W1MYKeq0i5/ui.html stack_pivoted: 0 filepath_r: C:\Datop\good2.good filepath: C:\Datop\good2.good		2148270085	0

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

parent_process	excel.exe				martian_process	regsvr32 C:\Datop\good.good
parent_process	excel.exe				martian_process	"C:\Windows\System32\regsvr32.exe" C:\Datop\good1.good
parent_process	excel.exe				martian_process	"C:\Windows\System32\regsvr32.exe" C:\Datop\good.good
parent_process	excel.exe				martian_process	regsvr32 C:\Datop\good1.good
parent_process	excel.exe				martian_process	"C:\Windows\System32\regsvr32.exe" C:\Datop\good2.good
parent_process	excel.exe				martian_process	regsvr32 C:\Datop\good2.good

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

file	C:\Windows\System32\regsvr32.exe