mystic | 17c7cc079465da191a8ed1512b8088b869415f5bc5bccf3eb72b0820b7f35619

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20231222-en
resource tags

arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system
submitted
04-01-2024 23:08

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General

Target

WEXTRACT.exe
Size

427KB
MD5

be982f88b4dc59376512980069e223e6
SHA1

0e410efd5f98f96ae5cea91ea60a827db48bdb11
SHA256

17c7cc079465da191a8ed1512b8088b869415f5bc5bccf3eb72b0820b7f35619
SHA512

b763f0235689765d1aceefc76925cc6b714630e1760b6e221b378263e9019e18f5f2002bcbb242ce1016efbc0ff79d7645c3025e7b7a6f27daba02552377a197
SSDEEP

6144:K2y+bnr+Bp0yN90QEF6VvTOaAJL63hsjz+7Ha3th4oIrfwXxp3DMgZtyXs2bBub9:+MrZy90KdIJLUxstfWfwXxpzMg+RQ9

Score

10^/10

mystic smokeloader backdoor persistence stealer trojan

Malware Config

Extracted

Family

smokeloader

Version

2022

http://77.91.68.29/fks/

rc4.i32

Signatures

Detect Mystic stealer payload 4 IoCs

resource	yara_rule
behavioral2/memory/3836-23-0x0000000000400000-0x0000000000428000-memory.dmp	mystic_family
behavioral2/memory/3836-21-0x0000000000400000-0x0000000000428000-memory.dmp	mystic_family
behavioral2/memory/3836-20-0x0000000000400000-0x0000000000428000-memory.dmp	mystic_family
behavioral2/memory/3836-19-0x0000000000400000-0x0000000000428000-memory.dmp	mystic_family

Mystic
Mystic is an infostealer written in C++.
stealer mystic
SmokeLoader
Modular backdoor trojan in use since 2014.
trojan backdoor smokeloader

Executes dropped EXE 5 IoCs

pid	Process
4664	v0143080.exe
4376	a8638369.exe
184	b5299161.exe
4832	c2304229.exe
1968	dbtsrss

Adds Run key to start application 2 TTPs 2 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\\\""	WEXTRACT.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\\\""	v0143080.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4376 set thread context of 116	4376	a8638369.exe	96
PID 184 set thread context of 3836	184	b5299161.exe	108

Program crash 3 IoCs

pid	pid_target	Process	procid_target
4972	4376	WerFault.exe
1444	3836	WerFault.exe
624	184	WerFault.exe	100

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
116	AppLaunch.exe
116	AppLaunch.exe
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found
3504	Process not Found

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
116	AppLaunch.exe

Suspicious use of UnmapMainImage 1 IoCs

pid	Process
3504	Process not Found

Suspicious use of WriteProcessMemory 34 IoCs

description	pid	Process	procid_target
PID 1920 wrote to memory of 4664	1920	WEXTRACT.exe	98
PID 1920 wrote to memory of 4664	1920	WEXTRACT.exe	98
PID 1920 wrote to memory of 4664	1920	WEXTRACT.exe	98
PID 4664 wrote to memory of 4376	4664	v0143080.exe	97
PID 4664 wrote to memory of 4376	4664	v0143080.exe	97
PID 4664 wrote to memory of 4376	4664	v0143080.exe	97
PID 4376 wrote to memory of 116	4376	a8638369.exe	96
PID 4376 wrote to memory of 116	4376	a8638369.exe	96
PID 4376 wrote to memory of 116	4376	a8638369.exe	96
PID 4376 wrote to memory of 116	4376	a8638369.exe	96
PID 4376 wrote to memory of 116	4376	a8638369.exe	96
PID 4376 wrote to memory of 116	4376	a8638369.exe	96
PID 4664 wrote to memory of 184	4664	v0143080.exe	100
PID 4664 wrote to memory of 184	4664	v0143080.exe	100
PID 4664 wrote to memory of 184	4664	v0143080.exe	100
PID 184 wrote to memory of 220	184	b5299161.exe	101
PID 184 wrote to memory of 220	184	b5299161.exe	101
PID 184 wrote to memory of 220	184	b5299161.exe	101
PID 184 wrote to memory of 3052	184	b5299161.exe	109
PID 184 wrote to memory of 3052	184	b5299161.exe	109
PID 184 wrote to memory of 3052	184	b5299161.exe	109
PID 184 wrote to memory of 3836	184	b5299161.exe	108
PID 184 wrote to memory of 3836	184	b5299161.exe	108
PID 184 wrote to memory of 3836	184	b5299161.exe	108
PID 184 wrote to memory of 3836	184	b5299161.exe	108
PID 184 wrote to memory of 3836	184	b5299161.exe	108
PID 184 wrote to memory of 3836	184	b5299161.exe	108
PID 184 wrote to memory of 3836	184	b5299161.exe	108
PID 184 wrote to memory of 3836	184	b5299161.exe	108
PID 184 wrote to memory of 3836	184	b5299161.exe	108
PID 184 wrote to memory of 3836	184	b5299161.exe	108
PID 1920 wrote to memory of 4832	1920	WEXTRACT.exe	107
PID 1920 wrote to memory of 4832	1920	WEXTRACT.exe	107
PID 1920 wrote to memory of 4832	1920	WEXTRACT.exe	107

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\WEXTRACT.exe
"C:\Users\Admin\AppData\Local\Temp\WEXTRACT.exe"
1⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:1920
- C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\v0143080.exe
  C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\v0143080.exe
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of WriteProcessMemory
  PID:4664
- - C:\Users\Admin\AppData\Local\Temp\IXP001.TMP\b5299161.exe
    C:\Users\Admin\AppData\Local\Temp\IXP001.TMP\b5299161.exe
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:184
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe"
      4⤵
      PID:220
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 184 -s 608
      4⤵
      Program crash
      PID:624
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe"
      4⤵
      PID:3836
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe"
      4⤵
      PID:3052
- C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\c2304229.exe
  C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\c2304229.exe
  2⤵
  - Executes dropped EXE
  PID:4832

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 4376 -ip 4376
1⤵
PID:460

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4376 -s 584
1⤵
- Program crash
PID:4972

C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe"
1⤵
- Checks SCSI registry key(s)
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
PID:116

C:\Users\Admin\AppData\Local\Temp\IXP001.TMP\a8638369.exe
C:\Users\Admin\AppData\Local\Temp\IXP001.TMP\a8638369.exe
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4376

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 544 -p 184 -ip 184
1⤵
PID:4864

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3836 -s 540
1⤵
- Program crash
PID:1444

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 560 -p 3836 -ip 3836
1⤵
PID:5084

C:\Users\Admin\AppData\Roaming\dbtsrss
C:\Users\Admin\AppData\Roaming\dbtsrss
1⤵
- Executes dropped EXE
PID:1968

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

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

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

C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\v0143080.exe

Filesize
325KB

MD5
6d3e807bc5b1075951cb02aee1040ce4

SHA1
e46b8731eb240af658cd92f869b9c4c48255d572

SHA256
3044994d68ed802e317cd4395ed588a0928dd006e4359ff907691fdcfd3b45f7

SHA512
b2bccf1135ef7a8d0adfeaa158933e730206e0cbf3920ffab0a8aad0eda01d6c14ac176bf0215bcb0e77385b6f5562fb1ddb7e87a8acb8cfdb3290dd1800ea2f

Download Submit
C:\Users\Admin\AppData\Local\Temp\IXP001.TMP\a8638369.exe

Filesize
166KB

MD5
6b3b5578bfce84e4564382d8dcb84c88

SHA1
fbe695d073f9bf1c4480f0da2e75de798d58deba

SHA256
48eab4277fff7669eb09844dd2d5de7a5edc2a487a6a4ef9b540785fff1bc9c1

SHA512
c4b48b40fdb6ebdbfd4cd6c42a4ce34c8a5d4e74163eda9cb197e7bad1a2d2bb80653b1ecb47dbb4ad106e1570663945de22301623aceef70c802354091957f8

Download Submit
C:\Users\Admin\AppData\Local\Temp\IXP001.TMP\b5299161.exe

Filesize
276KB

MD5
12d4bca9bbb0cd07025f3dcaed7eb23a

SHA1
ac51d5a3e131b07440e63d4e1d28ac29431aebf3

SHA256
f50a9e7dc019f9e0e7505636e2616867326662af461b34f43946263301fa6ee1

SHA512
9630feebdd23900b7db614d5edce27d17511036c439f754116cc2ddb84e5950b62c2a7ff3dfab9abb6ab6f5f9e6f2db4a883a9ad987de8db14f4a2a78da3099d

Download Submit
C:\Users\Admin\AppData\Local\Temp\IXP001.TMP\b5299161.exe

Filesize
92KB

MD5
d845d020c5a9a23417739a81c3deeb01

SHA1
93f4623b3c5bec52cf7ed03a5efc4747bc6f8c11

SHA256
ddfba974503d3e2cb2be859fda19971e571c4df9167f9b8ccc66bcab35583fe1

SHA512
7013ff4c2649e44fa26ddbd3f218951fdc187c9137cd4e77bbff03e83c2bbf4b55c7cebae21ffcc3987a3ea7674cc065224712989a98d817fbb7574f4c1b73f6

Download Submit
C:\Users\Admin\AppData\Roaming\dbtsrss

Filesize
101KB

MD5
89d41e1cf478a3d3c2c701a27a5692b2

SHA1
691e20583ef80cb9a2fd3258560e7f02481d12fd

SHA256
dc5ac8d4d6d5b230ab73415c80439b4da77da1cfde18214ef601897f661abdac

SHA512
5c9658f6ca0d8d067bfc76072c438ac13daa12d8c1fef33369e1bc36a592d160a2bdb22b4f3eed73e8670bb65107a4134e18e6dc604897a80cc0768769f475dc

Download Submit
C:\Users\Admin\AppData\Roaming\dbtsrss

Filesize
65KB

MD5
dd33a5e42a605baf20ef30022c8e8868

SHA1
0fa579d7d8b1f9ae272aca6bee4a4662b48a8865

SHA256
0bc834f9566101f894bd2daeb923b9545e6faff9eeab332e5310a5ec638b69a5

SHA512
20b047c81db3c8db1df14a888f4001f85fa3be79ec2b30086045aec1e4b6ee4d8dc02a9cd4c2ebf96e7fee86b56bbfc042d16e206a74a34455a8588988ed1063

Download Submit
memory/116-15-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/116-14-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/116-28-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/3504-27-0x0000000002410000-0x0000000002426000-memory.dmp

Filesize
88KB

Download
memory/3836-23-0x0000000000400000-0x0000000000428000-memory.dmp

Filesize
160KB

Download
memory/3836-19-0x0000000000400000-0x0000000000428000-memory.dmp

Filesize
160KB

Download
memory/3836-20-0x0000000000400000-0x0000000000428000-memory.dmp

Filesize
160KB

Download
memory/3836-21-0x0000000000400000-0x0000000000428000-memory.dmp

Filesize
160KB

Download