xloader | 207dff33f6f91f114deae60a6cb3a404a5f40bc607fb6015f680c8980af7ac16

General

Target

Unpaid invoice.exe
Size

548KB
MD5

3ade5b9b508051cc39c1c610f4af5a12
SHA1

662056878a2b1fb1e99d1f74bb0e8694904fdccd
SHA256

207dff33f6f91f114deae60a6cb3a404a5f40bc607fb6015f680c8980af7ac16
SHA512

a99f9f23663bc09fca19a96968a15014679e8bbe2bb4a6f64897a34b86faf72848af138b4dbdcda1ef19d4e2488e81dc447c50af5e05f2c67cf7521b070c3d0f

Score

10^/10

xloader b6cu loader rat suricata

Malware Config

Extracted

Family

xloader

Version

2.3

Campaign

b6cu

C2

http://www.allfyllofficial.com/b6cu/

Decoy

sxdiyan.com

web0084.com

cpafirmspokane.com

la-bio-geo.com

chacrit.com

stuntfighting.com

rjsworkshop.com

themillennialsfinest.com

thefrontrealestate.com

chairmn.com

best1korea.com

gudssutu.icu

backupchip.net

shrikanthamimports.com

sportrecoverysleeve.com

healthy-shack.com

investperwear.com

intertradeperu.com

resonantonshop.com

greghugheslaw.com

Signatures

Xloader
Xloader is a rebranded version of Formbook malware.
loader xloader
suricata: ET MALWARE FormBook CnC Checkin (GET)
suricata: ET MALWARE FormBook CnC Checkin (GET)
suricata

Xloader Payload 3 IoCs

rat

Processes:

resource	yara_rule
behavioral2/memory/4660-126-0x0000000000400000-0x0000000000429000-memory.dmp	xloader
behavioral2/memory/4660-127-0x000000000041D0B0-mapping.dmp	xloader
behavioral2/memory/4736-135-0x00000000004F0000-0x0000000000519000-memory.dmp	xloader

Blocklisted process makes network request 1 IoCs

Processes:

msiexec.exe

flow pid process

40 4736 msiexec.exe

flow	pid	process
40	4736	msiexec.exe

Suspicious use of SetThreadContext 3 IoCs

Processes:

Unpaid invoice.exeUnpaid invoice.exemsiexec.exe

description	pid	process	target process
PID 4528 set thread context of 4660	4528	Unpaid invoice.exe	Unpaid invoice.exe
PID 4660 set thread context of 1832	4660	Unpaid invoice.exe	Explorer.EXE
PID 4736 set thread context of 1832	4736	msiexec.exe	Explorer.EXE

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exe

pid process

4648 schtasks.exe

pid	process
4648	schtasks.exe

Modifies registry class 2 IoCs

Processes:

Explorer.EXE

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\CLSID\{4336a54d-038b-4685-ab02-99bb52d3fb8b}\Instance	Explorer.EXE
Key created	\REGISTRY\USER\S-1-5-21-2559286294-2439613352-4032193287-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance	Explorer.EXE

Suspicious behavior: EnumeratesProcesses 48 IoCs

Processes:

Unpaid invoice.exeUnpaid invoice.exemsiexec.exe

pid	process
4528	Unpaid invoice.exe
4528	Unpaid invoice.exe
4660	Unpaid invoice.exe
4660	Unpaid invoice.exe
4660	Unpaid invoice.exe
4660	Unpaid invoice.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe
4736	msiexec.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

Explorer.EXE

pid process

1832 Explorer.EXE
Suspicious behavior: MapViewOfSection 5 IoCs

Processes:

Unpaid invoice.exemsiexec.exe

pid process

4660 Unpaid invoice.exe
4660 Unpaid invoice.exe
4660 Unpaid invoice.exe
4736 msiexec.exe
4736 msiexec.exe

pid	process
1832	Explorer.EXE

pid	process
4660	Unpaid invoice.exe
4660	Unpaid invoice.exe
4660	Unpaid invoice.exe
4736	msiexec.exe
4736	msiexec.exe

Suspicious use of AdjustPrivilegeToken 15 IoCs

Processes:

Unpaid invoice.exeUnpaid invoice.exemsiexec.exeExplorer.EXE

description	pid	process
Token: SeDebugPrivilege	4528	Unpaid invoice.exe
Token: SeDebugPrivilege	4660	Unpaid invoice.exe
Token: SeDebugPrivilege	4736	msiexec.exe
Token: SeShutdownPrivilege	1832	Explorer.EXE
Token: SeCreatePagefilePrivilege	1832	Explorer.EXE
Token: SeShutdownPrivilege	1832	Explorer.EXE
Token: SeCreatePagefilePrivilege	1832	Explorer.EXE
Token: SeShutdownPrivilege	1832	Explorer.EXE
Token: SeCreatePagefilePrivilege	1832	Explorer.EXE
Token: SeShutdownPrivilege	1832	Explorer.EXE
Token: SeCreatePagefilePrivilege	1832	Explorer.EXE
Token: SeShutdownPrivilege	1832	Explorer.EXE
Token: SeCreatePagefilePrivilege	1832	Explorer.EXE
Token: SeShutdownPrivilege	1832	Explorer.EXE
Token: SeCreatePagefilePrivilege	1832	Explorer.EXE

Suspicious use of FindShellTrayWindow 4 IoCs

Processes:

Explorer.EXE

pid process

1832 Explorer.EXE
1832 Explorer.EXE
1832 Explorer.EXE
1832 Explorer.EXE

pid	process
1832	Explorer.EXE
1832	Explorer.EXE
1832	Explorer.EXE
1832	Explorer.EXE

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

Unpaid invoice.exeExplorer.EXEmsiexec.exe

description	pid	process	target process
PID 4528 wrote to memory of 4648	4528	Unpaid invoice.exe	schtasks.exe
PID 4528 wrote to memory of 4648	4528	Unpaid invoice.exe	schtasks.exe
PID 4528 wrote to memory of 4648	4528	Unpaid invoice.exe	schtasks.exe
PID 4528 wrote to memory of 4660	4528	Unpaid invoice.exe	Unpaid invoice.exe
PID 4528 wrote to memory of 4660	4528	Unpaid invoice.exe	Unpaid invoice.exe
PID 4528 wrote to memory of 4660	4528	Unpaid invoice.exe	Unpaid invoice.exe
PID 4528 wrote to memory of 4660	4528	Unpaid invoice.exe	Unpaid invoice.exe
PID 4528 wrote to memory of 4660	4528	Unpaid invoice.exe	Unpaid invoice.exe
PID 4528 wrote to memory of 4660	4528	Unpaid invoice.exe	Unpaid invoice.exe
PID 1832 wrote to memory of 4736	1832	Explorer.EXE	msiexec.exe
PID 1832 wrote to memory of 4736	1832	Explorer.EXE	msiexec.exe
PID 1832 wrote to memory of 4736	1832	Explorer.EXE	msiexec.exe
PID 4736 wrote to memory of 4772	4736	msiexec.exe	cmd.exe
PID 4736 wrote to memory of 4772	4736	msiexec.exe	cmd.exe
PID 4736 wrote to memory of 4772	4736	msiexec.exe	cmd.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Modifies registry class
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
PID:1832

C:\Users\Admin\AppData\Local\Temp\Unpaid invoice.exe
"C:\Users\Admin\AppData\Local\Temp\Unpaid invoice.exe"
2⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4528

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\NBYchW" /XML "C:\Users\Admin\AppData\Local\Temp\tmpB06A.tmp"
3⤵
- Creates scheduled task(s)
PID:4648

C:\Users\Admin\AppData\Local\Temp\Unpaid invoice.exe
"C:\Users\Admin\AppData\Local\Temp\Unpaid invoice.exe"
3⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
PID:4660

C:\Windows\SysWOW64\msiexec.exe
"C:\Windows\SysWOW64\msiexec.exe"
2⤵
- Blocklisted process makes network request
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4736

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Admin\AppData\Local\Temp\Unpaid invoice.exe"
3⤵
PID:4772

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

memory/1832-130-0x0000000005800000-0x0000000005949000-memory.dmp

Filesize
1.3MB

Download
memory/1832-139-0x00000000011B0000-0x000000000127F000-memory.dmp

Filesize
828KB

Download
memory/4528-117-0x0000000005960000-0x0000000005961000-memory.dmp

Filesize
4KB

Download
memory/4528-118-0x0000000005500000-0x0000000005501000-memory.dmp

Filesize
4KB

Download
memory/4528-119-0x00000000054C0000-0x00000000054C1000-memory.dmp

Filesize
4KB

Download
memory/4528-120-0x0000000005830000-0x0000000005831000-memory.dmp

Filesize
4KB

Download
memory/4528-121-0x00000000054D0000-0x00000000054D7000-memory.dmp

Filesize
28KB

Download
memory/4528-122-0x0000000005460000-0x000000000595E000-memory.dmp

Filesize
5.0MB

Download
memory/4528-123-0x00000000061C0000-0x000000000621E000-memory.dmp

Filesize
376KB

Download
memory/4528-124-0x0000000008830000-0x000000000885A000-memory.dmp

Filesize
168KB

Download
memory/4528-115-0x0000000000C00000-0x0000000000C01000-memory.dmp

Filesize
4KB

Download
memory/4648-125-0x0000000000000000-mapping.dmp

Download
memory/4660-126-0x0000000000400000-0x0000000000429000-memory.dmp

Filesize
164KB

Download
memory/4660-128-0x0000000000E80000-0x00000000011A0000-memory.dmp

Filesize
3.1MB

Download
memory/4660-129-0x00000000005F0000-0x0000000000600000-memory.dmp

Filesize
64KB

Download
memory/4660-127-0x000000000041D0B0-mapping.dmp

Download
memory/4736-131-0x0000000000000000-mapping.dmp

Download
memory/4736-134-0x00000000013C0000-0x00000000013D2000-memory.dmp

Filesize
72KB

Download
memory/4736-135-0x00000000004F0000-0x0000000000519000-memory.dmp

Filesize
164KB

Download
memory/4736-137-0x0000000000F80000-0x00000000012A0000-memory.dmp

Filesize
3.1MB

Download
memory/4736-138-0x0000000000E00000-0x0000000000E8F000-memory.dmp

Filesize
572KB

Download
memory/4772-136-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

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Downloads