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

Summary | ZeroBOX

IBS_Cortana.exe

Malicious Library UPX PE32 PE File DLL

Category	Machine	Started	Completed
FILE	s1_win7_x6401	Aug. 3, 2023, 10:15 a.m.	Aug. 3, 2023, 10:18 a.m.

Size	376.1KB
Type	PE32 executable (GUI) Intel 80386, for MS Windows, Nullsoft Installer self-extracting archive
MD5	`08defe80ace1f032875c8127ae5e4481`
SHA256	`ac131e3fbcd040f4a5f0dc8e90d3c77bb98d934d5c6696de510ca89f18599062`
CRC32	`E2A0081D`
ssdeep	`6144:3BebKFxUGBNC3Iu5gro6xBcbKiydMdh5BwprYXUdOTDuCUkJf1dqDQrFGCf:4KFxc3Iu5g86xKbUdOmrUUdmuROOkrF5`
Yara	UPX_Zero - UPX packed file Malicious_Library_Zero - Malicious_Library PE_Header_Zero - PE File Signature IsPE32 - (no description)

IBS_Cortana.exe "C:\Users\test22\AppData\Local\Temp\IBS_Cortana.exe"
2544

Name	Response	Post-Analysis Lookup
www.potent-tech.com		119.28.69.86

IP Address	Status	Action
No hosts contacted.

Suricata Alerts

No Suricata Alerts

Suricata TLS

No Suricata TLS

Checks amount of memory in system, this can be used to detect virtual machines that have a low amount of memory available (1 event)

Time & API	Arguments	Status	Return	Repeated
GlobalMemoryStatusEx Aug. 3, 2023, 10:15 a.m.		1	1	0

The executable contains unknown PE section names indicative of a packer (could be a false positive) (1 event)

section

.ndata

Allocates read-write-execute memory (usually to unpack itself) (3 events)

Time & API	Arguments	Status	Return	Repeated
NtProtectVirtualMemory Aug. 3, 2023, 10:15 a.m.	process_identifier: 2544 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x73272000 process_handle: 0xffffffff	1	0	0
NtProtectVirtualMemory Aug. 3, 2023, 10:15 a.m.	process_identifier: 2544 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x10004000 process_handle: 0xffffffff	1	0	0
NtAllocateVirtualMemory Aug. 3, 2023, 10:15 a.m.	process_identifier: 2544 region_size: 13070336 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x04130000 allocation_type: 12288 (MEM_COMMIT\|MEM_RESERVE) process_handle: 0xffffffff	1	0	0

Creates executable files on the filesystem (1 event)

file	C:\Users\test22\AppData\Local\Temp\nsbEFEE.tmp\System.dll

Drops an executable to the user AppData folder (1 event)

file	C:\Users\test22\AppData\Local\Temp\nsbEFEE.tmp\System.dll

File has been identified by 21 AntiVirus engines on VirusTotal as malicious (21 events)

Bkav	W32.AIDetectMalware
Elastic	malicious (high confidence)
MicroWorld-eScan	Gen:Variant.Nemesis.26073
FireEye	Generic.mg.08defe80ace1f032
Malwarebytes	Malware.AI.871869256
BitDefender	Gen:Variant.Nemesis.26073
CrowdStrike	win/malicious_confidence_70% (W)
ESET-NOD32	NSIS/Injector.BZR
APEX	Malicious
Kaspersky	HEUR:Trojan.Win32.Guloader.gen
Sophos	Generic ML PUA (PUA)
Trapmine	suspicious.low.ml.score
Emsisoft	Gen:Variant.Nemesis.26073 (B)
MAX	malware (ai score=83)
Arcabit	Trojan.Nemesis.D65D9
ZoneAlarm	HEUR:Trojan.Win32.Guloader.gen
GData	Gen:Variant.Nemesis.26073
Cylance	unsafe
Tencent	Win32.Trojan.FalseSign.Timw
AVG	FileRepMalware [Trj]
Avast	FileRepMalware [Trj]