smokeloader | 390d7472201e8ea9bdc6c7fa2b4ab1f6faca02071f1f997037cc5f52759a9cb6

Resubmissions

12-11-2021 18:04

211112-wnzb8aahhm 10

19-11-2020 10:08

201119-rhwlt38jrx 10

18-11-2020 17:26

201118-htd4fq29va 10

Analysis

max time kernel
1801s
max time network
1811s
platform
windows10_x64
resource
win10v20201028
submitted
19-11-2020 10:08

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Report Analysis Logs

General

Target

HYDRA.exe

Score

10^/10

smokeloader backdoor persistence trojan

Malware Config

Extracted

Family

smokeloader

Version

2017

http://92.53.105.14/

Signatures

SmokeLoader
Modular backdoor trojan in use since 2014.
trojan backdoor smokeloader
Suspicious use of NtCreateUserProcessOtherParentProcess 2 IoCs

Processes:

svchost.exe

description pid process target process

PID 628 created 3076 628 svchost.exe starter.exe
PID 628 created 3076 628 svchost.exe starter.exe
Executes dropped EXE 10 IoCs

Processes:

yaya.exeva.exeufx.exesant.exepower.exestarter.exeusc.exeusc.exeusc.exeusc.exe

pid process

3524 yaya.exe
3212 va.exe
3608 ufx.exe
3468 sant.exe
2896 power.exe
3076 starter.exe
3540 usc.exe
3988 usc.exe
2076 usc.exe
3812 usc.exe
Drops startup file 1 IoCs

Processes:

va.exe

description ioc process

File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\HDAudo.vbs va.exe

description	pid	process	target process
PID 628 created 3076	628	svchost.exe	starter.exe
PID 628 created 3076	628	svchost.exe	starter.exe

pid	process
3524	yaya.exe
3212	va.exe
3608	ufx.exe
3468	sant.exe
2896	power.exe
3076	starter.exe
3540	usc.exe
3988	usc.exe
2076	usc.exe
3812	usc.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\HDAudo.vbs	va.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

explorer.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\Classes = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\ahecdbir\\bwwttfrb.exe"	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run	explorer.exe

Maps connected drives based on registry 3 TTPs 2 IoCs

Disk information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Processes:

sant.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	sant.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum\0	sant.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 4 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

SCHTASKS.exeSCHTASKS.exeSCHTASKS.exeSCHTASKS.exe

pid process

3152 SCHTASKS.exe
768 SCHTASKS.exe
4012 SCHTASKS.exe
3576 SCHTASKS.exe

pid	process
3152	SCHTASKS.exe
768	SCHTASKS.exe
4012	SCHTASKS.exe
3576	SCHTASKS.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

sant.exe

pid	process
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe
3468	sant.exe

Suspicious behavior: MapViewOfSection 2 IoCs

Processes:

sant.exe

pid process

3468 sant.exe
3468 sant.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

Processes:

usc.exesvchost.exestarter.exepowershell.exeusc.exeusc.exeusc.exe

description	pid	process
Token: SeDebugPrivilege	3540	usc.exe
Token: SeTcbPrivilege	628	svchost.exe
Token: SeTcbPrivilege	628	svchost.exe
Token: SeDebugPrivilege	3076	starter.exe
Token: SeDebugPrivilege	2800	powershell.exe
Token: SeDebugPrivilege	3988	usc.exe
Token: SeDebugPrivilege	2076	usc.exe
Token: SeDebugPrivilege	3812	usc.exe

Suspicious use of WriteProcessMemory 46 IoCs

Processes:

HYDRA.exeyaya.exeufx.exeusc.exesant.exestarter.execsc.exesvchost.exepower.exeusc.exeusc.exeusc.exe

description	pid	process	target process
PID 576 wrote to memory of 3524	576	HYDRA.exe	yaya.exe
PID 576 wrote to memory of 3524	576	HYDRA.exe	yaya.exe
PID 576 wrote to memory of 3524	576	HYDRA.exe	yaya.exe
PID 576 wrote to memory of 3212	576	HYDRA.exe	va.exe
PID 576 wrote to memory of 3212	576	HYDRA.exe	va.exe
PID 576 wrote to memory of 3212	576	HYDRA.exe	va.exe
PID 576 wrote to memory of 3608	576	HYDRA.exe	ufx.exe
PID 576 wrote to memory of 3608	576	HYDRA.exe	ufx.exe
PID 576 wrote to memory of 3608	576	HYDRA.exe	ufx.exe
PID 576 wrote to memory of 3468	576	HYDRA.exe	sant.exe
PID 576 wrote to memory of 3468	576	HYDRA.exe	sant.exe
PID 576 wrote to memory of 3468	576	HYDRA.exe	sant.exe
PID 576 wrote to memory of 2896	576	HYDRA.exe	power.exe
PID 576 wrote to memory of 2896	576	HYDRA.exe	power.exe
PID 576 wrote to memory of 2896	576	HYDRA.exe	power.exe
PID 3524 wrote to memory of 3076	3524	yaya.exe	starter.exe
PID 3524 wrote to memory of 3076	3524	yaya.exe	starter.exe
PID 3608 wrote to memory of 3540	3608	ufx.exe	usc.exe
PID 3608 wrote to memory of 3540	3608	ufx.exe	usc.exe
PID 3608 wrote to memory of 3540	3608	ufx.exe	usc.exe
PID 3540 wrote to memory of 3152	3540	usc.exe	SCHTASKS.exe
PID 3540 wrote to memory of 3152	3540	usc.exe	SCHTASKS.exe
PID 3540 wrote to memory of 3152	3540	usc.exe	SCHTASKS.exe
PID 3468 wrote to memory of 416	3468	sant.exe	explorer.exe
PID 3468 wrote to memory of 416	3468	sant.exe	explorer.exe
PID 3468 wrote to memory of 416	3468	sant.exe	explorer.exe
PID 3076 wrote to memory of 492	3076	starter.exe	csc.exe
PID 3076 wrote to memory of 492	3076	starter.exe	csc.exe
PID 492 wrote to memory of 3276	492	csc.exe	cvtres.exe
PID 492 wrote to memory of 3276	492	csc.exe	cvtres.exe
PID 628 wrote to memory of 3512	628	svchost.exe	cmd.exe
PID 628 wrote to memory of 3512	628	svchost.exe	cmd.exe
PID 628 wrote to memory of 3952	628	svchost.exe	cmd.exe
PID 628 wrote to memory of 3952	628	svchost.exe	cmd.exe
PID 2896 wrote to memory of 2800	2896	power.exe	powershell.exe
PID 2896 wrote to memory of 2800	2896	power.exe	powershell.exe
PID 2896 wrote to memory of 2800	2896	power.exe	powershell.exe
PID 3988 wrote to memory of 768	3988	usc.exe	SCHTASKS.exe
PID 3988 wrote to memory of 768	3988	usc.exe	SCHTASKS.exe
PID 3988 wrote to memory of 768	3988	usc.exe	SCHTASKS.exe
PID 2076 wrote to memory of 4012	2076	usc.exe	SCHTASKS.exe
PID 2076 wrote to memory of 4012	2076	usc.exe	SCHTASKS.exe
PID 2076 wrote to memory of 4012	2076	usc.exe	SCHTASKS.exe
PID 3812 wrote to memory of 3576	3812	usc.exe	SCHTASKS.exe
PID 3812 wrote to memory of 3576	3812	usc.exe	SCHTASKS.exe
PID 3812 wrote to memory of 3576	3812	usc.exe	SCHTASKS.exe

C:\Users\Admin\AppData\Local\Temp\HYDRA.exe
"C:\Users\Admin\AppData\Local\Temp\HYDRA.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:576

C:\Users\Admin\AppData\Roaming\yaya.exe
C:\Users\Admin\AppData\Roaming\yaya.exe
2⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:3524

C:\Windows\Temp\{1945BBS40-8571-3DA1-BB29-HYDRA7A13A1E}\starter.exe
"C:\Windows\Temp\{1945BBS40-8571-3DA1-BB29-HYDRA7A13A1E}\starter.exe"
3⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3076

C:\Windows\Microsoft.NET\Framework64\v2.0.50727\csc.exe
"C:\Windows\Microsoft.NET\Framework64\v2.0.50727\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\fuyr5mj-.cmdline"
4⤵
- Suspicious use of WriteProcessMemory
PID:492

C:\Windows\Microsoft.NET\Framework64\v2.0.50727\cvtres.exe
C:\Windows\Microsoft.NET\Framework64\v2.0.50727\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RESA04.tmp" "c:\Users\Admin\AppData\Local\Temp\CSC9F4.tmp"
5⤵
PID:3276

C:\Windows\System32\cmd.exe
"C:\Windows\System32\cmd.exe"
4⤵
PID:3512

C:\Windows\System32\cmd.exe
"C:\Windows\System32\cmd.exe"
4⤵
PID:3952

C:\Users\Admin\AppData\Roaming\va.exe
C:\Users\Admin\AppData\Roaming\va.exe
2⤵
- Executes dropped EXE
- Drops startup file
PID:3212

C:\Users\Admin\AppData\Roaming\ufx.exe
C:\Users\Admin\AppData\Roaming\ufx.exe
2⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:3608

C:\ProgramData\ucp\usc.exe
"C:\ProgramData\ucp\usc.exe" /ucp/usc.exe
3⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3540

C:\Windows\SysWOW64\SCHTASKS.exe
SCHTASKS /Create /SC MINUTE /MO 10 /F /TN SystemOptimize /TR C:\ProgramData\ucp\usc.exe
4⤵
- Creates scheduled task(s)
PID:3152

C:\Users\Admin\AppData\Roaming\sant.exe
C:\Users\Admin\AppData\Roaming\sant.exe
2⤵
- Executes dropped EXE
- Maps connected drives based on registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:3468

C:\Windows\SysWOW64\explorer.exe
explorer.exe
3⤵
- Adds Run key to start application
PID:416

C:\Users\Admin\AppData\Roaming\power.exe
C:\Users\Admin\AppData\Roaming\power.exe
2⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:2896

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"
3⤵
- Suspicious use of AdjustPrivilegeToken
PID:2800

\??\c:\windows\system32\svchost.exe
c:\windows\system32\svchost.exe -k netsvcs -s seclogon
1⤵
- Suspicious use of NtCreateUserProcessOtherParentProcess
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:628

C:\ProgramData\ucp\usc.exe
C:\ProgramData\ucp\usc.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3988

C:\Windows\SysWOW64\SCHTASKS.exe
SCHTASKS /Create /SC MINUTE /MO 10 /F /TN SystemOptimize /TR C:\ProgramData\ucp\usc.exe
2⤵
- Creates scheduled task(s)
PID:768

C:\ProgramData\ucp\usc.exe
C:\ProgramData\ucp\usc.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2076

C:\Windows\SysWOW64\SCHTASKS.exe
SCHTASKS /Create /SC MINUTE /MO 10 /F /TN SystemOptimize /TR C:\ProgramData\ucp\usc.exe
2⤵
- Creates scheduled task(s)
PID:4012

C:\ProgramData\ucp\usc.exe
C:\ProgramData\ucp\usc.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3812

C:\Windows\SysWOW64\SCHTASKS.exe
SCHTASKS /Create /SC MINUTE /MO 10 /F /TN SystemOptimize /TR C:\ProgramData\ucp\usc.exe
2⤵
- Creates scheduled task(s)
PID:3576

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\ProgramData\ucp\usc.exe

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C:\ProgramData\ucp\usc.exe

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C:\ProgramData\ucp\usc.exe

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C:\ProgramData\ucp\usc.exe

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C:\ProgramData\ucp\usc.exe

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C:\Users\Admin\AppData\Local\Temp\RESA04.tmp

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C:\Users\Admin\AppData\Local\Temp\fuyr5mj-.dll

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C:\Users\Admin\AppData\Local\Temp\fuyr5mj-.pdb

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C:\Users\Admin\AppData\Roaming\power.exe

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C:\Users\Admin\AppData\Roaming\power.exe

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C:\Users\Admin\AppData\Roaming\sant.exe

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C:\Users\Admin\AppData\Roaming\sant.exe

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C:\Users\Admin\AppData\Roaming\ufx.exe

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C:\Users\Admin\AppData\Roaming\ufx.exe

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C:\Users\Admin\AppData\Roaming\va.exe

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C:\Users\Admin\AppData\Roaming\va.exe

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C:\Users\Admin\AppData\Roaming\yaya.exe

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C:\Users\Admin\AppData\Roaming\yaya.exe

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C:\Windows\Temp\{1945BBS40-8571-3DA1-BB29-HYDRA7A13A1E}\starter.exe

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C:\Windows\Temp\{1945BBS40-8571-3DA1-BB29-HYDRA7A13A1E}\starter.exe

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\??\c:\Users\Admin\AppData\Local\Temp\CSC9F4.tmp

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\??\c:\Users\Admin\AppData\Local\Temp\fuyr5mj-.0.cs

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\??\c:\Users\Admin\AppData\Local\Temp\fuyr5mj-.cmdline

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memory/416-25-0x0000000000C30000-0x000000000106F000-memory.dmp

Filesize
4.2MB

Download
memory/416-24-0x0000000000C30000-0x000000000106F000-memory.dmp

Filesize
4.2MB

Download
memory/416-23-0x0000000000000000-mapping.dmp

Download
memory/492-26-0x0000000000000000-mapping.dmp

Download
memory/768-47-0x0000000000000000-mapping.dmp

Download
memory/2800-45-0x00000000094E0000-0x00000000094E1000-memory.dmp

Filesize
4KB

Download
memory/2800-39-0x0000000007CD0000-0x0000000007CD1000-memory.dmp

Filesize
4KB

Download
memory/2800-44-0x0000000008800000-0x0000000008801000-memory.dmp

Filesize
4KB

Download
memory/2800-43-0x0000000008850000-0x0000000008851000-memory.dmp

Filesize
4KB

Download
memory/2800-42-0x00000000083D0000-0x00000000083D1000-memory.dmp

Filesize
4KB

Download
memory/2800-41-0x0000000008020000-0x0000000008021000-memory.dmp

Filesize
4KB

Download
memory/2800-34-0x0000000000000000-mapping.dmp

Download
memory/2800-35-0x0000000071810000-0x0000000071EFE000-memory.dmp

Filesize
6.9MB

Download
memory/2800-36-0x0000000004BF0000-0x0000000004BF1000-memory.dmp

Filesize
4KB

Download
memory/2800-37-0x0000000007630000-0x0000000007631000-memory.dmp

Filesize
4KB

Download
memory/2800-38-0x0000000007E70000-0x0000000007E71000-memory.dmp

Filesize
4KB

Download
memory/2800-40-0x0000000007F10000-0x0000000007F11000-memory.dmp

Filesize
4KB

Download
memory/2896-12-0x0000000000000000-mapping.dmp

Download
memory/3076-15-0x0000000000000000-mapping.dmp

Download
memory/3076-22-0x00007FFE9A360000-0x00007FFE9AD00000-memory.dmp

Filesize
9.6MB

Download
memory/3152-21-0x0000000000000000-mapping.dmp

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memory/3212-3-0x0000000000000000-mapping.dmp

Download
memory/3276-29-0x0000000000000000-mapping.dmp

Download
memory/3468-9-0x0000000000000000-mapping.dmp

Download
memory/3524-0-0x0000000000000000-mapping.dmp

Download
memory/3540-18-0x0000000000000000-mapping.dmp

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memory/3576-51-0x0000000000000000-mapping.dmp

Download
memory/3608-6-0x0000000000000000-mapping.dmp

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memory/4012-49-0x0000000000000000-mapping.dmp

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