stealc | a9816b1f5c43253c0b7af790ee87e29c8203b12bdd2dac78d59c9f4c375f629a

Analysis

max time kernel
149s
max time network
156s
platform
windows11-21h2_x64
resource
win11-20240221-en
resource tags

arch:x64arch:x86image:win11-20240221-enlocale:en-usos:windows11-21h2-x64system
submitted
28/03/2024, 16:38

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General

Target

a9816b1f5c43253c0b7af790ee87e29c8203b12bdd2dac78d59c9f4c375f629a.exe
Size

404KB
MD5

54762ca46c348dc6ab92e12250adbc68
SHA1

aa8cafaf45d914c3a1fcb9618b1662dd83bfa3b9
SHA256

a9816b1f5c43253c0b7af790ee87e29c8203b12bdd2dac78d59c9f4c375f629a
SHA512

92115352b14f7c6170513baba26baeff174c2ef9813919fc0fcb1d89fc1b0b0ad32daafa25cee3b832eb7c5bb63c8874744431300b6dbc8d8424b05090f099f5
SSDEEP

12288:RzCZe/AA78MB6arGKFZqee8rFXUlgH4E0:R2OIMlHvl2gHF0

Score

10^/10

stealc discovery spyware stealer upx

Malware Config

Extracted

Family

stealc

http://185.172.128.209

Attributes

url_path
/3cd2b41cbde8fc9c.php

Signatures

Stealc
Stealc is an infostealer written in C++.
stealer stealc
Downloads MZ/PE file

Executes dropped EXE 3 IoCs

pid	Process
3488	u3tk.0.exe
1032	u3tk.1.exe
1144	EGCBFIEHIE.exe

Loads dropped DLL 2 IoCs

pid	Process
3488	u3tk.0.exe
3488	u3tk.0.exe

Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

UPX packed file 3 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/files/0x0002000000029ef5-23.dat	upx
behavioral2/memory/1032-29-0x0000000000400000-0x0000000000930000-memory.dmp	upx
behavioral2/memory/1032-122-0x0000000000400000-0x0000000000930000-memory.dmp	upx

Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials In Files
T1552.001
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Program crash 4 IoCs

pid	pid_target	Process	procid_target
3472	4952	WerFault.exe	78
3000	3488	WerFault.exe	80
3124	3488	WerFault.exe	80
672	3488	WerFault.exe	80

Checks processor information in registry 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	u3tk.0.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	u3tk.0.exe

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/Job

T1053

pid	Process
4832	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2468	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3488	u3tk.0.exe
3488	u3tk.0.exe
3488	u3tk.0.exe
3488	u3tk.0.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1032	u3tk.1.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 4952 wrote to memory of 3488	4952	a9816b1f5c43253c0b7af790ee87e29c8203b12bdd2dac78d59c9f4c375f629a.exe	80
PID 4952 wrote to memory of 3488	4952	a9816b1f5c43253c0b7af790ee87e29c8203b12bdd2dac78d59c9f4c375f629a.exe	80
PID 4952 wrote to memory of 3488	4952	a9816b1f5c43253c0b7af790ee87e29c8203b12bdd2dac78d59c9f4c375f629a.exe	80
PID 4952 wrote to memory of 1032	4952	a9816b1f5c43253c0b7af790ee87e29c8203b12bdd2dac78d59c9f4c375f629a.exe	83
PID 4952 wrote to memory of 1032	4952	a9816b1f5c43253c0b7af790ee87e29c8203b12bdd2dac78d59c9f4c375f629a.exe	83
PID 4952 wrote to memory of 1032	4952	a9816b1f5c43253c0b7af790ee87e29c8203b12bdd2dac78d59c9f4c375f629a.exe	83
PID 1032 wrote to memory of 3336	1032	u3tk.1.exe	87
PID 1032 wrote to memory of 3336	1032	u3tk.1.exe	87
PID 1032 wrote to memory of 3336	1032	u3tk.1.exe	87
PID 3336 wrote to memory of 1216	3336	cmd.exe	89
PID 3336 wrote to memory of 1216	3336	cmd.exe	89
PID 3336 wrote to memory of 1216	3336	cmd.exe	89
PID 3336 wrote to memory of 4832	3336	cmd.exe	90
PID 3336 wrote to memory of 4832	3336	cmd.exe	90
PID 3336 wrote to memory of 4832	3336	cmd.exe	90
PID 3488 wrote to memory of 5020	3488	u3tk.0.exe	91
PID 3488 wrote to memory of 5020	3488	u3tk.0.exe	91
PID 3488 wrote to memory of 5020	3488	u3tk.0.exe	91
PID 5020 wrote to memory of 1144	5020	cmd.exe	94
PID 5020 wrote to memory of 1144	5020	cmd.exe	94
PID 5020 wrote to memory of 1144	5020	cmd.exe	94
PID 1144 wrote to memory of 2968	1144	EGCBFIEHIE.exe	98
PID 1144 wrote to memory of 2968	1144	EGCBFIEHIE.exe	98
PID 1144 wrote to memory of 2968	1144	EGCBFIEHIE.exe	98
PID 2968 wrote to memory of 2468	2968	cmd.exe	100
PID 2968 wrote to memory of 2468	2968	cmd.exe	100
PID 2968 wrote to memory of 2468	2968	cmd.exe	100

C:\Users\Admin\AppData\Local\Temp\a9816b1f5c43253c0b7af790ee87e29c8203b12bdd2dac78d59c9f4c375f629a.exe
"C:\Users\Admin\AppData\Local\Temp\a9816b1f5c43253c0b7af790ee87e29c8203b12bdd2dac78d59c9f4c375f629a.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4952
- C:\Users\Admin\AppData\Local\Temp\u3tk.0.exe
  "C:\Users\Admin\AppData\Local\Temp\u3tk.0.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:3488
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" /c start "" "C:\Users\Admin\AppData\Local\Temp\EGCBFIEHIE.exe"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:5020
  - - C:\Users\Admin\AppData\Local\Temp\EGCBFIEHIE.exe
      "C:\Users\Admin\AppData\Local\Temp\EGCBFIEHIE.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of WriteProcessMemory
      PID:1144
    - - C:\Windows\SysWOW64\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C ping 2.2.2.2 -n 1 -w 3000 > Nul & Del C:\Users\Admin\AppData\Local\Temp\EGCBFIEHIE.exe
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:2968
      - C:\Windows\SysWOW64\PING.EXE
        
        ping 2.2.2.2 -n 1 -w 3000
        6⤵
        Runs ping.exe
        
        PID:2468
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 3488 -s 2420
    3⤵
    - Program crash
    PID:3000
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 3488 -s 2428
    3⤵
    - Program crash
    PID:3124
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 3488 -s 2468
    3⤵
    - Program crash
    PID:672
- C:\Users\Admin\AppData\Local\Temp\u3tk.1.exe
  "C:\Users\Admin\AppData\Local\Temp\u3tk.1.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1032
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\Temp\Task.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3336
  - - C:\Windows\SysWOW64\chcp.com
      chcp 1251
      4⤵
      PID:1216
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /tn "MalayamaraUpdate" /tr "'C:\Users\Admin\AppData\Local\Temp\Updater.exe'" /sc minute /mo 30 /F
      4⤵
      Creates scheduled task(s)
      PID:4832
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4952 -s 1160
  2⤵
  - Program crash
  PID:3472

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 4952 -ip 4952
1⤵
PID:4484

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 488 -p 3488 -ip 3488
1⤵
PID:1540

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 3488 -ip 3488
1⤵
PID:4880

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 400 -p 3488 -ip 3488
1⤵
PID:4008

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\Are.docx

Filesize
11KB

MD5
a33e5b189842c5867f46566bdbf7a095

SHA1
e1c06359f6a76da90d19e8fd95e79c832edb3196

SHA256
5abf8e3d1f78de7b09d7f6fb87f9e80e60caacf13ef3c1289665653dacd7c454

SHA512
f2ad3812ec9b915e9618539b0f103f2e9acaad25fbbacd84941c954ce070af231324e83a4621e951c1dbae8d40d50410954e40dd52bbd46e34c54b0d1957407b

Download Submit
C:\ProgramData\mozglue.dll

Filesize
593KB

MD5
c8fd9be83bc728cc04beffafc2907fe9

SHA1
95ab9f701e0024cedfbd312bcfe4e726744c4f2e

SHA256
ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a

SHA512
fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040

Download Submit
C:\ProgramData\nss3.dll

Filesize
2.0MB

MD5
1cc453cdf74f31e4d913ff9c10acdde2

SHA1
6e85eae544d6e965f15fa5c39700fa7202f3aafe

SHA256
ac5c92fe6c51cfa742e475215b83b3e11a4379820043263bf50d4068686c6fa5

SHA512
dd9ff4e06b00dc831439bab11c10e9b2ae864ea6e780d3835ea7468818f35439f352ef137da111efcdf2bb6465f6ca486719451bf6cf32c6a4420a56b1d64571

Download Submit
C:\Users\Admin\AppData\Local\Temp\EGCBFIEHIE.exe

Filesize
106KB

MD5
fe380780b5c35bd6d54541791151c2be

SHA1
7fe3a583cf91474c733f85cebf3c857682e269e1

SHA256
b64a84d1f88e4e78464a1901c1cb5bbd5f00bb73203d719e64e072157a087b53

SHA512
ba05ba8aa13c4bc1cf98fbf6c08b021e8b19354098e0397fc8e1e5d3dcce367c1063203f24e50d0973193f6535681d0a43486e5dade5d112853b7a2fe8739b6c

Download Submit
C:\Users\Admin\AppData\Local\Temp\u3tk.0.exe

Filesize
259KB

MD5
33cb94d692d4ced59558b5aac83f25ed

SHA1
14347ca8832295c7145e0aa44f805ca5190f9391

SHA256
99c7b09f4f912134366464588c5e17d780af8e5097512e8e08a209ab677f45ea

SHA512
30c68a7ac843c2044df4875bfe9a26227b6c8b1a7bca6bb5534085267d97c51686362e2858d647985dc2f073a27b9a064d75187d2c617a66ff7db0ce8d177f66

Download Submit
C:\Users\Admin\AppData\Local\Temp\u3tk.1.exe

Filesize
1.7MB

MD5
eee5ddcffbed16222cac0a1b4e2e466e

SHA1
28b40c88b8ea50b0782e2bcbb4cc0f411035f3d5

SHA256
2a40e5dccc7526c4982334941c90f95374460e2a816e84e724e98c4d52ae8c54

SHA512
8f88901f3ebd425818db09f268df19ccf8a755603f04e9481bcf02b112a84393f8a900ead77f8f971bfa33fd9fa5636b7494aaee864a0fb04e3273911a4216dc

Download Submit
C:\Users\Admin\AppData\Roaming\Temp\Task.bat

Filesize
128B

MD5
11bb3db51f701d4e42d3287f71a6a43e

SHA1
63a4ee82223be6a62d04bdfe40ef8ba91ae49a86

SHA256
6be22058abfb22b40a42fb003f86b89e204a83024c03eb82cd53e2a0a047c331

SHA512
907ad2c070cc1db89f43459a94d7f48985d939d749c9648b78572a266f0d3fde47813a129e9151dbf4a7d96d36f588172f57c88b8b947b56ed818d7d068abab2

Download Submit
memory/1032-122-0x0000000000400000-0x0000000000930000-memory.dmp

Filesize
5.2MB

Download
memory/1032-30-0x0000000001040000-0x0000000001041000-memory.dmp

Filesize
4KB

Download
memory/1032-131-0x0000000001040000-0x0000000001041000-memory.dmp

Filesize
4KB

Download
memory/1032-29-0x0000000000400000-0x0000000000930000-memory.dmp

Filesize
5.2MB

Download
memory/1144-123-0x0000000000F10000-0x0000000000F30000-memory.dmp

Filesize
128KB

Download
memory/1144-128-0x0000000071CD0000-0x0000000072481000-memory.dmp

Filesize
7.7MB

Download
memory/1144-125-0x0000000005930000-0x0000000005940000-memory.dmp

Filesize
64KB

Download
memory/1144-124-0x0000000071CD0000-0x0000000072481000-memory.dmp

Filesize
7.7MB

Download
memory/3488-18-0x0000000000400000-0x0000000000AEA000-memory.dmp

Filesize
6.9MB

Download
memory/3488-121-0x0000000000400000-0x0000000000AEA000-memory.dmp

Filesize
6.9MB

Download
memory/3488-16-0x0000000000D00000-0x0000000000E00000-memory.dmp

Filesize
1024KB

Download
memory/3488-17-0x0000000000CD0000-0x0000000000CF7000-memory.dmp

Filesize
156KB

Download
memory/3488-31-0x0000000061E00000-0x0000000061EF3000-memory.dmp

Filesize
972KB

Download
memory/4952-2-0x0000000002970000-0x00000000029DE000-memory.dmp

Filesize
440KB

Download
memory/4952-1-0x0000000000C40000-0x0000000000D40000-memory.dmp

Filesize
1024KB

Download
memory/4952-3-0x0000000000400000-0x0000000000B0E000-memory.dmp

Filesize
7.1MB

Download
memory/4952-52-0x0000000000400000-0x0000000000B0E000-memory.dmp

Filesize
7.1MB

Download