buer | e173a639506cfac3f65723d711ad072d18b95f2776581d43407e1ffb6bec441f

General

Target

f539613bb8aa110f64481c22d073f510_JaffaCakes118.exe
Size

236KB
MD5

f539613bb8aa110f64481c22d073f510
SHA1

c961c5aec12d17d0e6427bb2886619d604947c9a
SHA256

e173a639506cfac3f65723d711ad072d18b95f2776581d43407e1ffb6bec441f
SHA512

dba51c39a1d9f8cfe9d2a9b1cd9b06cb25f8bc60d3cae43105bb32cee0e7ff96960bd2438d4ee6e641a1416c05a5c67036696e195bb9f1cf17e49ebf158fc276
SSDEEP

3072:sR9HSUA9Au2+coOnrvBcopuYYtZRsROxO1fcjBN27oZV3DwdOwUqx+LR3:49HdA9A1oyTBcop1jQxO98bvUUqcF

Score

10^/10

buer discovery loader persistence

Malware Config

Extracted

Family

buer

C2

https://gstatiknetiplist.cc/

https://gstatiknetiplist.com/

Signatures

Buer
Buer is a new modular loader first seen in August 2019.
loader buer

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-457978338-2990298471-2379561640-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\ErrorResponder\\responder.exe\""	responder.exe

Buer Loader 7 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral1/memory/572-2-0x00000000002A0000-0x00000000002AA000-memory.dmp	buer
behavioral1/memory/572-3-0x0000000040000000-0x000000004000C000-memory.dmp	buer
behavioral1/memory/572-4-0x0000000040000000-0x0000000042824000-memory.dmp	buer
behavioral1/memory/572-6-0x00000000002A0000-0x00000000002AA000-memory.dmp	buer
behavioral1/memory/572-7-0x0000000040000000-0x000000004000C000-memory.dmp	buer
behavioral1/memory/2572-24-0x0000000040000000-0x0000000042824000-memory.dmp	buer
behavioral1/memory/2572-45-0x0000000040000000-0x0000000042824000-memory.dmp	buer

Deletes itself 1 IoCs

pid	Process
2572	responder.exe

Executes dropped EXE 1 IoCs

pid	Process
2572	responder.exe

Loads dropped DLL 2 IoCs

pid	Process
572	f539613bb8aa110f64481c22d073f510_JaffaCakes118.exe
572	f539613bb8aa110f64481c22d073f510_JaffaCakes118.exe

Enumerates connected drives 3 TTPs 23 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\G:	responder.exe
File opened (read-only)	\??\K:	responder.exe
File opened (read-only)	\??\M:	responder.exe
File opened (read-only)	\??\S:	responder.exe
File opened (read-only)	\??\T:	responder.exe
File opened (read-only)	\??\Y:	responder.exe
File opened (read-only)	\??\Z:	responder.exe
File opened (read-only)	\??\B:	responder.exe
File opened (read-only)	\??\E:	responder.exe
File opened (read-only)	\??\J:	responder.exe
File opened (read-only)	\??\L:	responder.exe
File opened (read-only)	\??\P:	responder.exe
File opened (read-only)	\??\U:	responder.exe
File opened (read-only)	\??\H:	responder.exe
File opened (read-only)	\??\I:	responder.exe
File opened (read-only)	\??\N:	responder.exe
File opened (read-only)	\??\Q:	responder.exe
File opened (read-only)	\??\A:	responder.exe
File opened (read-only)	\??\O:	responder.exe
File opened (read-only)	\??\R:	responder.exe
File opened (read-only)	\??\V:	responder.exe
File opened (read-only)	\??\W:	responder.exe
File opened (read-only)	\??\X:	responder.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2412	2064	WerFault.exe	31

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	f539613bb8aa110f64481c22d073f510_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	responder.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	secinit.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2572	responder.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 572 wrote to memory of 2572	572	f539613bb8aa110f64481c22d073f510_JaffaCakes118.exe	30
PID 572 wrote to memory of 2572	572	f539613bb8aa110f64481c22d073f510_JaffaCakes118.exe	30
PID 572 wrote to memory of 2572	572	f539613bb8aa110f64481c22d073f510_JaffaCakes118.exe	30
PID 572 wrote to memory of 2572	572	f539613bb8aa110f64481c22d073f510_JaffaCakes118.exe	30
PID 2572 wrote to memory of 2064	2572	responder.exe	31
PID 2572 wrote to memory of 2064	2572	responder.exe	31
PID 2572 wrote to memory of 2064	2572	responder.exe	31
PID 2572 wrote to memory of 2064	2572	responder.exe	31
PID 2572 wrote to memory of 2064	2572	responder.exe	31
PID 2572 wrote to memory of 2064	2572	responder.exe	31
PID 2572 wrote to memory of 2064	2572	responder.exe	31
PID 2572 wrote to memory of 2064	2572	responder.exe	31
PID 2572 wrote to memory of 2064	2572	responder.exe	31
PID 2572 wrote to memory of 2064	2572	responder.exe	31
PID 2572 wrote to memory of 2064	2572	responder.exe	31
PID 2064 wrote to memory of 2412	2064	secinit.exe	32
PID 2064 wrote to memory of 2412	2064	secinit.exe	32
PID 2064 wrote to memory of 2412	2064	secinit.exe	32
PID 2064 wrote to memory of 2412	2064	secinit.exe	32

C:\Users\Admin\AppData\Local\Temp\f539613bb8aa110f64481c22d073f510_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\f539613bb8aa110f64481c22d073f510_JaffaCakes118.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:572
- C:\ProgramData\ErrorResponder\responder.exe
  C:\ProgramData\ErrorResponder\responder.exe "C:\Users\Admin\AppData\Local\Temp\f539613bb8aa110f64481c22d073f510_JaffaCakes118.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Deletes itself
  - Executes dropped EXE
  - Enumerates connected drives
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2572
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\ErrorResponder\responder.exe
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2064
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2064 -s 136
      4⤵
      Program crash
      PID:2412

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

\ProgramData\ErrorResponder\responder.exe

Filesize
236KB

MD5
f539613bb8aa110f64481c22d073f510

SHA1
c961c5aec12d17d0e6427bb2886619d604947c9a

SHA256
e173a639506cfac3f65723d711ad072d18b95f2776581d43407e1ffb6bec441f

SHA512
dba51c39a1d9f8cfe9d2a9b1cd9b06cb25f8bc60d3cae43105bb32cee0e7ff96960bd2438d4ee6e641a1416c05a5c67036696e195bb9f1cf17e49ebf158fc276

Download Submit
memory/572-2-0x00000000002A0000-0x00000000002AA000-memory.dmp

Filesize
40KB

Download
memory/572-1-0x0000000000310000-0x0000000000410000-memory.dmp

Filesize
1024KB

Download
memory/572-3-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/572-5-0x0000000000310000-0x0000000000410000-memory.dmp

Filesize
1024KB

Download
memory/572-4-0x0000000040000000-0x0000000042824000-memory.dmp

Filesize
40.1MB

Download
memory/572-6-0x00000000002A0000-0x00000000002AA000-memory.dmp

Filesize
40KB

Download
memory/572-7-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/2064-31-0x00000000004C0000-0x0000000002CE4000-memory.dmp

Filesize
40.1MB

Download
memory/2064-44-0x00000000000C0000-0x00000000000C1000-memory.dmp

Filesize
4KB

Download
memory/2064-42-0x00000000000C0000-0x00000000000C1000-memory.dmp

Filesize
4KB

Download
memory/2064-40-0x00000000000C0000-0x00000000000C1000-memory.dmp

Filesize
4KB

Download
memory/2064-38-0x00000000004C0000-0x0000000002CE4000-memory.dmp

Filesize
40.1MB

Download
memory/2064-36-0x00000000004C0000-0x0000000002CE4000-memory.dmp

Filesize
40.1MB

Download
memory/2064-34-0x00000000004C0000-0x0000000002CE4000-memory.dmp

Filesize
40.1MB

Download
memory/2064-32-0x00000000004C0000-0x0000000002CE4000-memory.dmp

Filesize
40.1MB

Download
memory/2572-24-0x0000000040000000-0x0000000042824000-memory.dmp

Filesize
40.1MB

Download
memory/2572-45-0x0000000040000000-0x0000000042824000-memory.dmp

Filesize
40.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads