buer | a5bcc672d91ff60374275df4680a61fac1ade6562d16851dd3e3acd2d2efab98

Analysis

max time kernel
150s
max time network
144s
platform
windows7_x64
resource
win7-20231129-en
resource tags

arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
submitted
13-03-2024 22:02

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General

Target

$TEMP/syncUpd.exe
Size

199KB
MD5

c30ba6943a94d2e8ed78cd2ca1bc207d
SHA1

9f72b0a089b6c66a1e81b25fe0b652f3bbb85b79
SHA256

d14472c3ab77a8e09ce45dbf6dfc686657539fc9520b510b4417f99114cfd7e8
SHA512

8080ae1b569b6f0f65814758ee3cdbf45f51e1411c731850751980b9310eb3493f64b6b85e681059f9354ea07fb110f1865f5b613c6dc90290f6fcb3b5b194a0
SSDEEP

3072:CHO6XigQe+JK1vljkjdv/oJIOSe7NC1RhrW2O4:C5Xp+WSjd38v7NC3

Score

10^/10

buer stealc discovery loader persistence spyware stealer

Malware Config

Extracted

Family

stealc

http://185.172.128.145

Attributes

url_path
/3cd2b41cbde8fc9c.php

Signatures

Buer
Buer is a new modular loader first seen in August 2019.
loader buer
Stealc
Stealc is an infostealer written in C++.
stealer stealc

Detect binaries embedding considerable number of MFA browser extension IDs. 9 IoCs

resource	yara_rule
behavioral7/memory/2344-4-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_MFA_Browser_Extension_IDs
behavioral7/memory/2344-35-0x00000000007D0000-0x00000000008D0000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_MFA_Browser_Extension_IDs
behavioral7/memory/2344-36-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_MFA_Browser_Extension_IDs
behavioral7/memory/2344-40-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_MFA_Browser_Extension_IDs
behavioral7/memory/2344-47-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_MFA_Browser_Extension_IDs
behavioral7/memory/2344-66-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_MFA_Browser_Extension_IDs
behavioral7/memory/2344-74-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_MFA_Browser_Extension_IDs
behavioral7/memory/2344-77-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_MFA_Browser_Extension_IDs
behavioral7/memory/2344-78-0x00000000007D0000-0x00000000008D0000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_MFA_Browser_Extension_IDs

Detect binaries embedding considerable number of cryptocurrency wallet browser extension IDs. 9 IoCs

resource	yara_rule
behavioral7/memory/2344-4-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_Crypto_Wallet_Browser_Extension_IDs
behavioral7/memory/2344-35-0x00000000007D0000-0x00000000008D0000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_Crypto_Wallet_Browser_Extension_IDs
behavioral7/memory/2344-36-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_Crypto_Wallet_Browser_Extension_IDs
behavioral7/memory/2344-40-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_Crypto_Wallet_Browser_Extension_IDs
behavioral7/memory/2344-47-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_Crypto_Wallet_Browser_Extension_IDs
behavioral7/memory/2344-66-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_Crypto_Wallet_Browser_Extension_IDs
behavioral7/memory/2344-74-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_Crypto_Wallet_Browser_Extension_IDs
behavioral7/memory/2344-77-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_Crypto_Wallet_Browser_Extension_IDs
behavioral7/memory/2344-78-0x00000000007D0000-0x00000000008D0000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_Crypto_Wallet_Browser_Extension_IDs

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 7 IoCs

resource	yara_rule
behavioral7/memory/2344-4-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral7/memory/2344-36-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral7/memory/2344-40-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral7/memory/2344-47-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral7/memory/2344-66-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral7/memory/2344-74-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral7/memory/2344-77-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers

Downloads MZ/PE file

Executes dropped EXE 1 IoCs

pid	Process
1988	KKFCFBKFCF.exe

Loads dropped DLL 1 IoCs

pid	Process
1108	cmd.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
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials In Files
T1552.001

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3627615824-4061627003-3019543961-1000\Software\Microsoft\Windows\CurrentVersion\Run\Ledger-Live Updater = "C:\\Users\\Admin\\AppData\\Local\\Temp\\KKFCFBKFCF.exe"	KKFCFBKFCF.exe

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

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

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1132	PING.EXE

Suspicious behavior: EnumeratesProcesses 51 IoCs

pid	Process
2344	syncUpd.exe
2344	syncUpd.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe
1988	KKFCFBKFCF.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1988	KKFCFBKFCF.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2344 wrote to memory of 1108	2344	syncUpd.exe	31
PID 2344 wrote to memory of 1108	2344	syncUpd.exe	31
PID 2344 wrote to memory of 1108	2344	syncUpd.exe	31
PID 2344 wrote to memory of 1108	2344	syncUpd.exe	31
PID 2344 wrote to memory of 1020	2344	syncUpd.exe	32
PID 2344 wrote to memory of 1020	2344	syncUpd.exe	32
PID 2344 wrote to memory of 1020	2344	syncUpd.exe	32
PID 2344 wrote to memory of 1020	2344	syncUpd.exe	32
PID 1108 wrote to memory of 1988	1108	cmd.exe	35
PID 1108 wrote to memory of 1988	1108	cmd.exe	35
PID 1108 wrote to memory of 1988	1108	cmd.exe	35
PID 1108 wrote to memory of 1988	1108	cmd.exe	35
PID 1988 wrote to memory of 1764	1988	KKFCFBKFCF.exe	36
PID 1988 wrote to memory of 1764	1988	KKFCFBKFCF.exe	36
PID 1988 wrote to memory of 1764	1988	KKFCFBKFCF.exe	36
PID 1988 wrote to memory of 1764	1988	KKFCFBKFCF.exe	36
PID 1764 wrote to memory of 1132	1764	cmd.exe	38
PID 1764 wrote to memory of 1132	1764	cmd.exe	38
PID 1764 wrote to memory of 1132	1764	cmd.exe	38
PID 1764 wrote to memory of 1132	1764	cmd.exe	38

C:\Users\Admin\AppData\Local\Temp\$TEMP\syncUpd.exe
"C:\Users\Admin\AppData\Local\Temp\$TEMP\syncUpd.exe"
1⤵
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2344
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\system32\cmd.exe" /c start "" "C:\Users\Admin\AppData\Local\Temp\KKFCFBKFCF.exe"
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:1108
- - C:\Users\Admin\AppData\Local\Temp\KKFCFBKFCF.exe
    "C:\Users\Admin\AppData\Local\Temp\KKFCFBKFCF.exe"
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:1988
  - - 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\KKFCFBKFCF.exe
      4⤵
      Suspicious use of WriteProcessMemory
      PID:1764
    - - C:\Windows\SysWOW64\PING.EXE
        
        ping 2.2.2.2 -n 1 -w 3000
        5⤵
        Runs ping.exe
        
        PID:1132
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\system32\cmd.exe" /c start "" "C:\Users\Admin\AppData\Local\Temp\HJJEHJJKJE.exe"
  2⤵
  PID:1020

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

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

Replay Monitor

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Downloads

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

Filesize
101KB

MD5
42b838cf8bdf67400525e128d917f6e0

SHA1
a578f6faec738912dba8c41e7abe1502c46d0cae

SHA256
0e4ffba62ce9a464aa1b7ff9f1e55ace8f51ff1e15102d856f801a81f8b4607d

SHA512
f64b39d885375251ab7db72c57dc5b5095f0c6412169f1035d1f6a25b8415a2a01004d06bfa0267cf683ef7dea7a9f969ad43fde5a4376f1fcb65a57403433c0

Download Submit
memory/1020-118-0x0000000000490000-0x0000000000491000-memory.dmp

Filesize
4KB

Download
memory/1988-120-0x0000000004C30000-0x0000000004C70000-memory.dmp

Filesize
256KB

Download
memory/1988-116-0x0000000073DE0000-0x00000000744CE000-memory.dmp

Filesize
6.9MB

Download
memory/1988-113-0x0000000000080000-0x000000000009E000-memory.dmp

Filesize
120KB

Download
memory/2344-47-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/2344-36-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/2344-40-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/2344-1-0x00000000007D0000-0x00000000008D0000-memory.dmp

Filesize
1024KB

Download
memory/2344-66-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/2344-74-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/2344-77-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/2344-78-0x00000000007D0000-0x00000000008D0000-memory.dmp

Filesize
1024KB

Download
memory/2344-35-0x00000000007D0000-0x00000000008D0000-memory.dmp

Filesize
1024KB

Download
memory/2344-6-0x0000000061E00000-0x0000000061EF3000-memory.dmp

Filesize
972KB

Download
memory/2344-4-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/2344-3-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/2344-2-0x0000000000220000-0x0000000000247000-memory.dmp

Filesize
156KB

Download