stealc | 39b1d8445ffdf6d7a837ae2f4e32e61d9c45e5dc70de36508aee32e71d5fcf15

General

Target

39b1d8445ffdf6d7a837ae2f4e32e61d9c45e5dc70de36508aee32e71d5fcf15.exe
Size

2.0MB
MD5

fc2c7acb7f944ec8f6e6013efeadcc4d
SHA1

60b0b07672bc06dbb3dd1706462d93245e6c19d0
SHA256

39b1d8445ffdf6d7a837ae2f4e32e61d9c45e5dc70de36508aee32e71d5fcf15
SHA512

24c23308b170c8d7eccf8daeb74ce32f3796f44aca916666242fbd5d434a0e666a0b63b45d03ec72acf35dcad9ac0ccc661d018e314f8f211f27765d25459027
SSDEEP

49152:L1mWYw2IAeRnwoe9UNiF3TDo64LJq1yHT9GvJ9bq5vWGXrRa:V+IAoJe9Jjc64lq1ET9GRZ6/9a

Score

10^/10

stealc discovery spyware stealer upx

Malware Config

Extracted

Family

stealc

C2

http://185.172.128.145

Attributes

url_path
/3cd2b41cbde8fc9c.php

Signatures

Stealc
Stealc is an infostealer written in C++.
stealer stealc

Executes dropped EXE 2 IoCs

pid	Process
3020	syncUpd.exe
4284	BroomSetup.exe

Loads dropped DLL 2 IoCs

pid	Process
4724	39b1d8445ffdf6d7a837ae2f4e32e61d9c45e5dc70de36508aee32e71d5fcf15.exe
4724	39b1d8445ffdf6d7a837ae2f4e32e61d9c45e5dc70de36508aee32e71d5fcf15.exe

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/0x00080000000231fb-25.dat	upx
behavioral2/memory/4284-27-0x0000000000400000-0x0000000000930000-memory.dmp	upx
behavioral2/memory/4284-33-0x0000000000400000-0x0000000000930000-memory.dmp	upx

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 1 IoCs

pid	pid_target	Process	procid_target
3244	3020	WerFault.exe	88

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	syncUpd.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	syncUpd.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
4244	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3020	syncUpd.exe
3020	syncUpd.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4284	BroomSetup.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4724 wrote to memory of 3020	4724	39b1d8445ffdf6d7a837ae2f4e32e61d9c45e5dc70de36508aee32e71d5fcf15.exe	88
PID 4724 wrote to memory of 3020	4724	39b1d8445ffdf6d7a837ae2f4e32e61d9c45e5dc70de36508aee32e71d5fcf15.exe	88
PID 4724 wrote to memory of 3020	4724	39b1d8445ffdf6d7a837ae2f4e32e61d9c45e5dc70de36508aee32e71d5fcf15.exe	88
PID 4724 wrote to memory of 4284	4724	39b1d8445ffdf6d7a837ae2f4e32e61d9c45e5dc70de36508aee32e71d5fcf15.exe	92
PID 4724 wrote to memory of 4284	4724	39b1d8445ffdf6d7a837ae2f4e32e61d9c45e5dc70de36508aee32e71d5fcf15.exe	92
PID 4724 wrote to memory of 4284	4724	39b1d8445ffdf6d7a837ae2f4e32e61d9c45e5dc70de36508aee32e71d5fcf15.exe	92
PID 4284 wrote to memory of 512	4284	BroomSetup.exe	93
PID 4284 wrote to memory of 512	4284	BroomSetup.exe	93
PID 4284 wrote to memory of 512	4284	BroomSetup.exe	93
PID 512 wrote to memory of 1812	512	cmd.exe	95
PID 512 wrote to memory of 1812	512	cmd.exe	95
PID 512 wrote to memory of 1812	512	cmd.exe	95
PID 512 wrote to memory of 4244	512	cmd.exe	96
PID 512 wrote to memory of 4244	512	cmd.exe	96
PID 512 wrote to memory of 4244	512	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\39b1d8445ffdf6d7a837ae2f4e32e61d9c45e5dc70de36508aee32e71d5fcf15.exe
"C:\Users\Admin\AppData\Local\Temp\39b1d8445ffdf6d7a837ae2f4e32e61d9c45e5dc70de36508aee32e71d5fcf15.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:4724
- C:\Users\Admin\AppData\Local\Temp\syncUpd.exe
  C:\Users\Admin\AppData\Local\Temp\syncUpd.exe
  2⤵
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  PID:3020
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 3020 -s 1332
    3⤵
    - Program crash
    PID:3244
- C:\Users\Admin\AppData\Local\Temp\BroomSetup.exe
  C:\Users\Admin\AppData\Local\Temp\BroomSetup.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4284
- - 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:512
  - - C:\Windows\SysWOW64\chcp.com
      chcp 1251
      4⤵
      PID:1812
  - - 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:4244

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 3020 -ip 3020
1⤵
PID:4944

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\BroomSetup.exe

Filesize
1.7MB

MD5
eee5ddcffbed16222cac0a1b4e2e466e

SHA1
28b40c88b8ea50b0782e2bcbb4cc0f411035f3d5

SHA256
2a40e5dccc7526c4982334941c90f95374460e2a816e84e724e98c4d52ae8c54

SHA512
8f88901f3ebd425818db09f268df19ccf8a755603f04e9481bcf02b112a84393f8a900ead77f8f971bfa33fd9fa5636b7494aaee864a0fb04e3273911a4216dc

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsp4623.tmp\INetC.dll

Filesize
21KB

MD5
2b342079303895c50af8040a91f30f71

SHA1
b11335e1cb8356d9c337cb89fe81d669a69de17e

SHA256
2d5d89025911e2e273f90f393624be4819641dbee1606de792362e442e54612f

SHA512
550452dadc86ecd205f40668894116790a456fe46e9985d68093d36cf32abf00edecb5c56ff0287464a0e819db7b3cc53926037a116de6c651332a7cc8035d47

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

Filesize
200KB

MD5
c722591f624fb69970f246b8c81d830f

SHA1
85516decea5d6987bebe39cbadf36053beaf4bb0

SHA256
13cd1152a19fdac6581cac2bd822f34bd3026ea1783ff231e299b6d28c046a6a

SHA512
822584c5c8a0813af4d845e80919776c71a43464ab719d1c303ebaae6a8ed47763183566bedc9be2e8c44de8ee6fd62d1e12be471e5d5c73ae4b1dcdaa34a908

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

Filesize
128B

MD5
11bb3db51f701d4e42d3287f71a6a43e

SHA1
63a4ee82223be6a62d04bdfe40ef8ba91ae49a86

SHA256
6be22058abfb22b40a42fb003f86b89e204a83024c03eb82cd53e2a0a047c331

SHA512
907ad2c070cc1db89f43459a94d7f48985d939d749c9648b78572a266f0d3fde47813a129e9151dbf4a7d96d36f588172f57c88b8b947b56ed818d7d068abab2

Download Submit
memory/3020-18-0x00000000007B0000-0x00000000007D7000-memory.dmp

Filesize
156KB

Download
memory/3020-19-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/3020-17-0x00000000008E0000-0x00000000009E0000-memory.dmp

Filesize
1024KB

Download
memory/3020-32-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/3020-35-0x00000000008E0000-0x00000000009E0000-memory.dmp

Filesize
1024KB

Download
memory/3020-47-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/4284-27-0x0000000000400000-0x0000000000930000-memory.dmp

Filesize
5.2MB

Download
memory/4284-28-0x0000000000F90000-0x0000000000F91000-memory.dmp

Filesize
4KB

Download
memory/4284-33-0x0000000000400000-0x0000000000930000-memory.dmp

Filesize
5.2MB

Download
memory/4284-37-0x0000000000F90000-0x0000000000F91000-memory.dmp

Filesize
4KB

Download
memory/4724-26-0x0000000000400000-0x000000000043D000-memory.dmp

Filesize
244KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads