smokeloader | ff3529106ae268386b681ecc0b2aa2a8dbe4e314bd63bd026d46039cf0d30f36

Analysis

max time kernel
203s
max time network
200s
platform
windows10-2004_x64
resource
win10v2004-20230915-en
resource tags

arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
submitted
11/10/2023, 19:16

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General

Target
dbabc5790631220bf25551f66f02d0f3.exe
Size 748KB
Sample231011-xytedsgc21
SHA256 ff3529106ae268386b681ecc0b2aa2a8dbe4e314bd63bd026d46039cf0d30f36
MD5 dbabc5790631220bf25551f66f02d0f3
SHA1 76f436b5bf935abace40a541c71884ffee05affa
SHA512 3a57a6bf26689ceef2aca686c9aa58ed778c2089ff70e20e51b826a2ab24d080457507a497a3921ecceb92e5ed4804115744071dea2ace3e7e16df7b6df09c12
SSDEEP 12288:1MrFy90bODHVsUA2Ysaeo+fJE4OrYP37jPYji+wXvViFOguC+VBwU:8ySgmUAKfJbOr27jgji+FFO+c
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

smokeloader backdoor evasion persistence trojan

Malware Config

Extracted

Family

smokeloader

Version

2022

http://77.91.68.29/fks/

rc4.i32

Signatures

Modifies Windows Defender Real-time Protection settings 3 TTPs 6 IoCs

evasion trojan

Modify Registry

T1112

Windows Service

T1543.003

Disable or Modify Tools

T1562.001

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableIOAVProtection = "1"	AppLaunch.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	AppLaunch.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableRealtimeMonitoring = "1"	AppLaunch.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	AppLaunch.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection	AppLaunch.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	AppLaunch.exe

SmokeLoader
Modular backdoor trojan in use since 2014.
trojan backdoor smokeloader

Executes dropped EXE 4 IoCs

pid	Process
2440	SY9Hw76.exe
4520	bu1bj80.exe
4732	1px48Wn1.exe
2260	3Gt68sG.exe

Adds Run key to start application 2 TTPs 3 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\wextract_cleanup0 = "rundll32.exe C:\\Windows\\system32\\advpack.dll,DelNodeRunDLL32 \"C:\\Users\\Admin\\AppData\\Local\\Temp\\IXP000.TMP\\\""	dbabc5790631220bf25551f66f02d0f3.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\wextract_cleanup1 = "rundll32.exe C:\\Windows\\system32\\advpack.dll,DelNodeRunDLL32 \"C:\\Users\\Admin\\AppData\\Local\\Temp\\IXP001.TMP\\\""	SY9Hw76.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\wextract_cleanup2 = "rundll32.exe C:\\Windows\\system32\\advpack.dll,DelNodeRunDLL32 \"C:\\Users\\Admin\\AppData\\Local\\Temp\\IXP002.TMP\\\""	bu1bj80.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4732 set thread context of 4336	4732	1px48Wn1.exe	87
PID 2260 set thread context of 4588	2260	3Gt68sG.exe	100

Program crash 2 IoCs

pid	pid_target	Process	procid_target
4932	4732	WerFault.exe	85
4324	2260	WerFault.exe	98

Checks SCSI registry key(s) 3 TTPs 3 IoCs

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

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	AppLaunch.exe
Key queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	AppLaunch.exe
Key enumerated	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	AppLaunch.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4336	AppLaunch.exe
4336	AppLaunch.exe
4588	AppLaunch.exe
4588	AppLaunch.exe
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found
3120	Process not Found

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
4588	AppLaunch.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4336	AppLaunch.exe

Suspicious use of WriteProcessMemory 29 IoCs

description	pid	Process	procid_target
PID 4804 wrote to memory of 2440	4804	dbabc5790631220bf25551f66f02d0f3.exe	83
PID 4804 wrote to memory of 2440	4804	dbabc5790631220bf25551f66f02d0f3.exe	83
PID 4804 wrote to memory of 2440	4804	dbabc5790631220bf25551f66f02d0f3.exe	83
PID 2440 wrote to memory of 4520	2440	SY9Hw76.exe	84
PID 2440 wrote to memory of 4520	2440	SY9Hw76.exe	84
PID 2440 wrote to memory of 4520	2440	SY9Hw76.exe	84
PID 4520 wrote to memory of 4732	4520	bu1bj80.exe	85
PID 4520 wrote to memory of 4732	4520	bu1bj80.exe	85
PID 4520 wrote to memory of 4732	4520	bu1bj80.exe	85
PID 4732 wrote to memory of 3656	4732	1px48Wn1.exe	86
PID 4732 wrote to memory of 3656	4732	1px48Wn1.exe	86
PID 4732 wrote to memory of 3656	4732	1px48Wn1.exe	86
PID 4732 wrote to memory of 4336	4732	1px48Wn1.exe	87
PID 4732 wrote to memory of 4336	4732	1px48Wn1.exe	87
PID 4732 wrote to memory of 4336	4732	1px48Wn1.exe	87
PID 4732 wrote to memory of 4336	4732	1px48Wn1.exe	87
PID 4732 wrote to memory of 4336	4732	1px48Wn1.exe	87
PID 4732 wrote to memory of 4336	4732	1px48Wn1.exe	87
PID 4732 wrote to memory of 4336	4732	1px48Wn1.exe	87
PID 4732 wrote to memory of 4336	4732	1px48Wn1.exe	87
PID 4520 wrote to memory of 2260	4520	bu1bj80.exe	98
PID 4520 wrote to memory of 2260	4520	bu1bj80.exe	98
PID 4520 wrote to memory of 2260	4520	bu1bj80.exe	98
PID 2260 wrote to memory of 4588	2260	3Gt68sG.exe	100
PID 2260 wrote to memory of 4588	2260	3Gt68sG.exe	100
PID 2260 wrote to memory of 4588	2260	3Gt68sG.exe	100
PID 2260 wrote to memory of 4588	2260	3Gt68sG.exe	100
PID 2260 wrote to memory of 4588	2260	3Gt68sG.exe	100
PID 2260 wrote to memory of 4588	2260	3Gt68sG.exe	100

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\dbabc5790631220bf25551f66f02d0f3.exe
"C:\Users\Admin\AppData\Local\Temp\dbabc5790631220bf25551f66f02d0f3.exe"
1⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:4804
- C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\SY9Hw76.exe
  C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\SY9Hw76.exe
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of WriteProcessMemory
  PID:2440
- - C:\Users\Admin\AppData\Local\Temp\IXP001.TMP\bu1bj80.exe
    C:\Users\Admin\AppData\Local\Temp\IXP001.TMP\bu1bj80.exe
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    - Suspicious use of WriteProcessMemory
    PID:4520
  - - C:\Users\Admin\AppData\Local\Temp\IXP002.TMP\1px48Wn1.exe
      C:\Users\Admin\AppData\Local\Temp\IXP002.TMP\1px48Wn1.exe
      4⤵
      Executes dropped EXE
      Suspicious use of SetThreadContext
      Suspicious use of WriteProcessMemory
      PID:4732
    - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
        
        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe"
        5⤵
        
        PID:3656
    - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
        
        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe"
        5⤵
        Modifies Windows Defender Real-time Protection settings
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:4336
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 4732 -s 580
        5⤵
        Program crash
        
        PID:4932
  - - C:\Users\Admin\AppData\Local\Temp\IXP002.TMP\3Gt68sG.exe
      C:\Users\Admin\AppData\Local\Temp\IXP002.TMP\3Gt68sG.exe
      4⤵
      Executes dropped EXE
      Suspicious use of SetThreadContext
      Suspicious use of WriteProcessMemory
      PID:2260
    - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
        
        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe"
        5⤵
        Checks SCSI registry key(s)
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: MapViewOfSection
        
        PID:4588
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 2260 -s 572
        5⤵
        Program crash
        
        PID:4324

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 4732 -ip 4732
1⤵
PID:3856

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 2260 -ip 2260
1⤵
PID:3848

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Defense Evasion

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

SY9Hw76.exe

Path C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\SY9Hw76.exe
Size 602KB
SHA256 fc5dcffe0b57c8d894cf70ddbf60677f62c8f31e41f8d11509760b09c2459160
MD5 378bb6e72ca5c8f9ae309b715e06281f
SHA1 c008812cfe985f0a8c4ad221187cd5b67a21962e
SHA512 aed8cde7cad5b6daec06b529a19e383f839db035627e372ad389308df1eedcd56df0a099c82acf31f63e11aa0e46007e6b072d6487bb001d6c4e476c4d36dad8
SSDEEP 12288:UMr3y90LZC7YmcE4OmYE37jPY+iSwEOqlFOgMMeL:jy2C7Y/bOmp7jg+iS1FOueL
MD5 SHA1 SHA512 SSDEEP

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SY9Hw76.exe

Path C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\SY9Hw76.exe
Size 602KB
SHA256 fc5dcffe0b57c8d894cf70ddbf60677f62c8f31e41f8d11509760b09c2459160
MD5 378bb6e72ca5c8f9ae309b715e06281f
SHA1 c008812cfe985f0a8c4ad221187cd5b67a21962e
SHA512 aed8cde7cad5b6daec06b529a19e383f839db035627e372ad389308df1eedcd56df0a099c82acf31f63e11aa0e46007e6b072d6487bb001d6c4e476c4d36dad8
SSDEEP 12288:UMr3y90LZC7YmcE4OmYE37jPY+iSwEOqlFOgMMeL:jy2C7Y/bOmp7jg+iS1FOueL
MD5 SHA1 SHA512 SSDEEP

Submit Download

bu1bj80.exe

Path C:\Users\Admin\AppData\Local\Temp\IXP001.TMP\bu1bj80.exe
Size 313KB
SHA256 f686f19e24703dfd97382c310cc8e8dbc3ee4d05bbd2ec5e9be6464029d07552
MD5 b58162f9622818dbc54488a0ea319ee8
SHA1 10eb7c02ae7f2f347ebd47b1dead9670409becb9
SHA512 fac90095c653b5790cf32085fb181d38270bc98685efd7287703f28de2cc1c0b2e2f644c24d1483d4d9b6419e1019c03a12ff84a6a2ab018132439d9e9c3bb91
SSDEEP 6144:KBy+bnr+4p0yN90QEiOw4f+8LkEo7jPlfFiMXcF:nMrky90MOenEo7jPBFiMXcF
MD5 SHA1 SHA512 SSDEEP

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bu1bj80.exe

Path C:\Users\Admin\AppData\Local\Temp\IXP001.TMP\bu1bj80.exe
Size 313KB
SHA256 f686f19e24703dfd97382c310cc8e8dbc3ee4d05bbd2ec5e9be6464029d07552
MD5 b58162f9622818dbc54488a0ea319ee8
SHA1 10eb7c02ae7f2f347ebd47b1dead9670409becb9
SHA512 fac90095c653b5790cf32085fb181d38270bc98685efd7287703f28de2cc1c0b2e2f644c24d1483d4d9b6419e1019c03a12ff84a6a2ab018132439d9e9c3bb91
SSDEEP 6144:KBy+bnr+4p0yN90QEiOw4f+8LkEo7jPlfFiMXcF:nMrky90MOenEo7jPBFiMXcF
MD5 SHA1 SHA512 SSDEEP

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1px48Wn1.exe

Path C:\Users\Admin\AppData\Local\Temp\IXP002.TMP\1px48Wn1.exe
Size 232KB
SHA256 69bba958a5dcd8650921b25d978c4847819eb83adc143ba2bd396811d7d73739
MD5 3ff825411b1fe07e712a5dcae34f80eb
SHA1 e3e4358cabfa74d6e36e26754b01ed78434a6877
SHA512 325c098b5a0a0ffee16a6074616126f9f4c7930b74507d38c63a294f659ab26fe1674af85a8ff495bd268aa821cc9d85f80f11ab1e7f828015920220e456ab81
SSDEEP 6144:hUmaJGO8xKVKpP0Ai7VSDFVJ37v6IAOR62jAmzn5:htaQxKVKpSMbj62kmN
MD5 SHA1 SHA512 SSDEEP

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1px48Wn1.exe

Path C:\Users\Admin\AppData\Local\Temp\IXP002.TMP\1px48Wn1.exe
Size 232KB
SHA256 69bba958a5dcd8650921b25d978c4847819eb83adc143ba2bd396811d7d73739
MD5 3ff825411b1fe07e712a5dcae34f80eb
SHA1 e3e4358cabfa74d6e36e26754b01ed78434a6877
SHA512 325c098b5a0a0ffee16a6074616126f9f4c7930b74507d38c63a294f659ab26fe1674af85a8ff495bd268aa821cc9d85f80f11ab1e7f828015920220e456ab81
SSDEEP 6144:hUmaJGO8xKVKpP0Ai7VSDFVJ37v6IAOR62jAmzn5:htaQxKVKpSMbj62kmN
MD5 SHA1 SHA512 SSDEEP

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3Gt68sG.exe

Path C:\Users\Admin\AppData\Local\Temp\IXP002.TMP\3Gt68sG.exe
Size 258KB
SHA256 998241c9c806336322ed7b4eafeda81449c1b31ff75ec7c71c613b6c6090ca60
MD5 65b85c3dad8211744cd9c52c39d57cc8
SHA1 0e284886d62cbeea9a772d0800357feb256ab741
SHA512 410a86768beb47c1e4332d0dc40caf49d1a1a8069382fd4b0965bd07dbaa30ba07df911a62f3b93c701372133e800d7a460a33470ab3b2069c7f39f1c3f6cbd9
SSDEEP 6144:BSmaEVENbffhzJ8uuJ3f6NkI+p9AOjb3/Rtc2w8Gn5:BHa/bffkLj9Jz5y2dw
MD5 SHA1 SHA512 SSDEEP

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3Gt68sG.exe

Path C:\Users\Admin\AppData\Local\Temp\IXP002.TMP\3Gt68sG.exe
Size 258KB
SHA256 998241c9c806336322ed7b4eafeda81449c1b31ff75ec7c71c613b6c6090ca60
MD5 65b85c3dad8211744cd9c52c39d57cc8
SHA1 0e284886d62cbeea9a772d0800357feb256ab741
SHA512 410a86768beb47c1e4332d0dc40caf49d1a1a8069382fd4b0965bd07dbaa30ba07df911a62f3b93c701372133e800d7a460a33470ab3b2069c7f39f1c3f6cbd9
SSDEEP 6144:BSmaEVENbffhzJ8uuJ3f6NkI+p9AOjb3/Rtc2w8Gn5:BHa/bffkLj9Jz5y2dw
MD5 SHA1 SHA512 SSDEEP

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memory/3120-31-0x0000000003040000-0x0000000003056000-memory.dmp

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memory/4336-23-0x00000000745F0000-0x0000000074DA0000-memory.dmp

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memory/4336-25-0x00000000745F0000-0x0000000074DA0000-memory.dmp

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memory/4336-22-0x00000000745F0000-0x0000000074DA0000-memory.dmp

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memory/4336-21-0x0000000000400000-0x000000000040A000-memory.dmp

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memory/4588-29-0x0000000000400000-0x0000000000409000-memory.dmp

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memory/4588-30-0x0000000000400000-0x0000000000409000-memory.dmp

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memory/4588-32-0x0000000000400000-0x0000000000409000-memory.dmp

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