stealc | 1ef3a2ecc4519f66684ba654314e41b8ae1a5ef5f404bb86ff68d4c008d023f7

Analysis

max time kernel
149s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
26/03/2024, 21:36

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General

Target

1ef3a2ecc4519f66684ba654314e41b8ae1a5ef5f404bb86ff68d4c008d023f7.exe
Size

455KB
MD5

388110de91fbac2c68d1c3b43a90194d
SHA1

37785c6f2c094ff985174ee9d1e998e98fb0bb78
SHA256

1ef3a2ecc4519f66684ba654314e41b8ae1a5ef5f404bb86ff68d4c008d023f7
SHA512

c9d20b39fa42afde6d4865936544d8bf164a3cfd7322fb8cfc09ec555b99bbb3c9f0d62a409377bc68465e39c4e4bf689bfa6c4efa2dc52bb8d0d40e2969c3a2
SSDEEP

6144:slhjYUy/NYVln5WeK0s9NVY1sCDnouTVf2xRqzEBU3CvAM6ugTKuFAF:8hjYrNYVlnZQkDoyfGsBGAMxwKuFAF

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

Checks computer location settings 2 TTPs 3 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-399997616-3400990511-967324271-1000\Control Panel\International\Geo\Nation	1ef3a2ecc4519f66684ba654314e41b8ae1a5ef5f404bb86ff68d4c008d023f7.exe
Key value queried	\REGISTRY\USER\S-1-5-21-399997616-3400990511-967324271-1000\Control Panel\International\Geo\Nation	u1rk.0.exe
Key value queried	\REGISTRY\USER\S-1-5-21-399997616-3400990511-967324271-1000\Control Panel\International\Geo\Nation	KFBGDBFBKK.exe

Executes dropped EXE 3 IoCs

pid	Process
4608	u1rk.0.exe
2020	u1rk.1.exe
3616	KFBGDBFBKK.exe

Loads dropped DLL 2 IoCs

pid	Process
4608	u1rk.0.exe
4608	u1rk.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
behavioral1/files/0x000800000002320e-20.dat	upx
behavioral1/memory/2020-26-0x0000000000400000-0x0000000000930000-memory.dmp	upx
behavioral1/memory/2020-81-0x0000000000400000-0x0000000000930000-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 2 IoCs

pid	pid_target	Process	procid_target
2580	2288	WerFault.exe	88
1984	4608	WerFault.exe	95

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	u1rk.0.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	u1rk.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
3540	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4852	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4608	u1rk.0.exe
4608	u1rk.0.exe
4608	u1rk.0.exe
4608	u1rk.0.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2020	u1rk.1.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 2288 wrote to memory of 4608	2288	1ef3a2ecc4519f66684ba654314e41b8ae1a5ef5f404bb86ff68d4c008d023f7.exe	95
PID 2288 wrote to memory of 4608	2288	1ef3a2ecc4519f66684ba654314e41b8ae1a5ef5f404bb86ff68d4c008d023f7.exe	95
PID 2288 wrote to memory of 4608	2288	1ef3a2ecc4519f66684ba654314e41b8ae1a5ef5f404bb86ff68d4c008d023f7.exe	95
PID 2288 wrote to memory of 2020	2288	1ef3a2ecc4519f66684ba654314e41b8ae1a5ef5f404bb86ff68d4c008d023f7.exe	99
PID 2288 wrote to memory of 2020	2288	1ef3a2ecc4519f66684ba654314e41b8ae1a5ef5f404bb86ff68d4c008d023f7.exe	99
PID 2288 wrote to memory of 2020	2288	1ef3a2ecc4519f66684ba654314e41b8ae1a5ef5f404bb86ff68d4c008d023f7.exe	99
PID 2020 wrote to memory of 2784	2020	u1rk.1.exe	104
PID 2020 wrote to memory of 2784	2020	u1rk.1.exe	104
PID 2020 wrote to memory of 2784	2020	u1rk.1.exe	104
PID 2784 wrote to memory of 4380	2784	cmd.exe	106
PID 2784 wrote to memory of 4380	2784	cmd.exe	106
PID 2784 wrote to memory of 4380	2784	cmd.exe	106
PID 2784 wrote to memory of 3540	2784	cmd.exe	107
PID 2784 wrote to memory of 3540	2784	cmd.exe	107
PID 2784 wrote to memory of 3540	2784	cmd.exe	107
PID 4608 wrote to memory of 4896	4608	u1rk.0.exe	113
PID 4608 wrote to memory of 4896	4608	u1rk.0.exe	113
PID 4608 wrote to memory of 4896	4608	u1rk.0.exe	113
PID 4896 wrote to memory of 3616	4896	cmd.exe	117
PID 4896 wrote to memory of 3616	4896	cmd.exe	117
PID 4896 wrote to memory of 3616	4896	cmd.exe	117
PID 3616 wrote to memory of 464	3616	KFBGDBFBKK.exe	118
PID 3616 wrote to memory of 464	3616	KFBGDBFBKK.exe	118
PID 3616 wrote to memory of 464	3616	KFBGDBFBKK.exe	118
PID 464 wrote to memory of 4852	464	cmd.exe	120
PID 464 wrote to memory of 4852	464	cmd.exe	120
PID 464 wrote to memory of 4852	464	cmd.exe	120

C:\Users\Admin\AppData\Local\Temp\1ef3a2ecc4519f66684ba654314e41b8ae1a5ef5f404bb86ff68d4c008d023f7.exe
"C:\Users\Admin\AppData\Local\Temp\1ef3a2ecc4519f66684ba654314e41b8ae1a5ef5f404bb86ff68d4c008d023f7.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2288
- C:\Users\Admin\AppData\Local\Temp\u1rk.0.exe
  "C:\Users\Admin\AppData\Local\Temp\u1rk.0.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:4608
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" /c start "" "C:\Users\Admin\AppData\Local\Temp\KFBGDBFBKK.exe"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4896
  - - C:\Users\Admin\AppData\Local\Temp\KFBGDBFBKK.exe
      "C:\Users\Admin\AppData\Local\Temp\KFBGDBFBKK.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Suspicious use of WriteProcessMemory
      PID:3616
    - - 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\KFBGDBFBKK.exe
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:464
      - C:\Windows\SysWOW64\PING.EXE
        
        ping 2.2.2.2 -n 1 -w 3000
        6⤵
        Runs ping.exe
        
        PID:4852
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4608 -s 2448
    3⤵
    - Program crash
    PID:1984
- C:\Users\Admin\AppData\Local\Temp\u1rk.1.exe
  "C:\Users\Admin\AppData\Local\Temp\u1rk.1.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2020
- - 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:2784
  - - C:\Windows\SysWOW64\chcp.com
      chcp 1251
      4⤵
      PID:4380
  - - 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:3540
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2288 -s 1516
  2⤵
  - Program crash
  PID:2580

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 2288 -ip 2288
1⤵
PID:3656

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 4608 -ip 4608
1⤵
PID:2184

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\KFBGDBFBKK.exe

Filesize
106KB

MD5
fe380780b5c35bd6d54541791151c2be

SHA1
7fe3a583cf91474c733f85cebf3c857682e269e1

SHA256
b64a84d1f88e4e78464a1901c1cb5bbd5f00bb73203d719e64e072157a087b53

SHA512
ba05ba8aa13c4bc1cf98fbf6c08b021e8b19354098e0397fc8e1e5d3dcce367c1063203f24e50d0973193f6535681d0a43486e5dade5d112853b7a2fe8739b6c

Download Submit
C:\Users\Admin\AppData\Local\Temp\u1rk.0.exe

Filesize
310KB

MD5
424d90170ce1b66f37da3fba9d52b2f4

SHA1
5a117567d16bc6077099bc9729101d5e0a80f06b

SHA256
2e0f953fbf4aa7b93fef3d149fdd58830f659b949ca3f6c4a5e556515c52938c

SHA512
f545330bf4b52405777d4479339640c4efb0a29dcc80358d8f9fe662388558f0b1d9545ca88a4ddf9f885f8220c9bc496f6fea8a474947a88b2fcd2e8ace501b

Download Submit
C:\Users\Admin\AppData\Local\Temp\u1rk.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/2020-81-0x0000000000400000-0x0000000000930000-memory.dmp

Filesize
5.2MB

Download
memory/2020-109-0x0000000000A10000-0x0000000000A11000-memory.dmp

Filesize
4KB

Download
memory/2020-27-0x0000000000A10000-0x0000000000A11000-memory.dmp

Filesize
4KB

Download
memory/2020-26-0x0000000000400000-0x0000000000930000-memory.dmp

Filesize
5.2MB

Download
memory/2288-28-0x0000000000400000-0x0000000000B1B000-memory.dmp

Filesize
7.1MB

Download
memory/2288-1-0x0000000000EE0000-0x0000000000FE0000-memory.dmp

Filesize
1024KB

Download
memory/2288-2-0x0000000000E40000-0x0000000000EAE000-memory.dmp

Filesize
440KB

Download
memory/2288-3-0x0000000000400000-0x0000000000B1B000-memory.dmp

Filesize
7.1MB

Download
memory/3616-139-0x0000000072200000-0x00000000729B0000-memory.dmp

Filesize
7.7MB

Download
memory/3616-135-0x0000000005380000-0x0000000005390000-memory.dmp

Filesize
64KB

Download
memory/3616-133-0x0000000072200000-0x00000000729B0000-memory.dmp

Filesize
7.7MB

Download
memory/3616-132-0x0000000000880000-0x00000000008A0000-memory.dmp

Filesize
128KB

Download
memory/4608-13-0x0000000000B20000-0x0000000000C20000-memory.dmp

Filesize
1024KB

Download
memory/4608-14-0x0000000000C80000-0x0000000000CA7000-memory.dmp

Filesize
156KB

Download
memory/4608-110-0x0000000000400000-0x0000000000AF7000-memory.dmp

Filesize
7.0MB

Download
memory/4608-87-0x0000000000400000-0x0000000000AF7000-memory.dmp

Filesize
7.0MB

Download
memory/4608-125-0x0000000000400000-0x0000000000AF7000-memory.dmp

Filesize
7.0MB

Download
memory/4608-86-0x0000000000400000-0x0000000000AF7000-memory.dmp

Filesize
7.0MB

Download
memory/4608-82-0x0000000000B20000-0x0000000000C20000-memory.dmp

Filesize
1024KB

Download
memory/4608-77-0x0000000000400000-0x0000000000AF7000-memory.dmp

Filesize
7.0MB

Download
memory/4608-134-0x0000000000400000-0x0000000000AF7000-memory.dmp

Filesize
7.0MB

Download
memory/4608-15-0x0000000000400000-0x0000000000AF7000-memory.dmp

Filesize
7.0MB

Download
memory/4608-29-0x0000000061E00000-0x0000000061EF3000-memory.dmp

Filesize
972KB

Download