buer | 54b7bba0fc0b998427ddd65c88fc8d5d5afe20304d043cd2831c6ca646bce0b0

Analysis

max time kernel
145s
max time network
148s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
19/09/2024, 03:37

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General

Target
ea8358576152f09c0ea641691ec51e09_JaffaCakes118.exe
Size 124KB
Sample240919-d6w1psyfrd
SHA256 54b7bba0fc0b998427ddd65c88fc8d5d5afe20304d043cd2831c6ca646bce0b0
MD5 ea8358576152f09c0ea641691ec51e09
SHA1 295076b9d5152fadd9a88b2933615e2d58b9f501
SHA512 39268cef0ae11605d357f5c6053bd1f50e169b8e704a76e71c0cec088362b16e3b8ead4c0ae5191618a22475727f1011549389132df74575e3c0190bc65f502b
SSDEEP 3072:Lf1BDZ0kVB67Duw9AMc+bEupgCJ6G8sl6E8j9MKZbEbOUuMaKESJNQ:L9X0Gg9p9ZD0MK2iUdM
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

buer discovery loader persistence

Malware Config

Extracted

Family

buer

https://eternitydev.me/
https://masonkhonsari.me/

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\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\906f399eff9916aa9bdf\\gennt.exe\""	gennt.exe

Buer Loader 6 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral1/memory/2468-15-0x0000000000020000-0x000000000002A000-memory.dmp	buer
behavioral1/memory/2468-16-0x0000000000030000-0x000000000003C000-memory.dmp	buer
behavioral1/memory/2468-18-0x0000000000030000-0x000000000003C000-memory.dmp	buer
behavioral1/memory/2468-26-0x0000000000030000-0x000000000003C000-memory.dmp	buer
behavioral1/memory/2548-28-0x0000000000030000-0x000000000003C000-memory.dmp	buer
behavioral1/memory/2548-30-0x0000000000030000-0x000000000003C000-memory.dmp	buer

Executes dropped EXE 2 IoCs

pid	Process
2468	tmp.exe
2548	gennt.exe

Loads dropped DLL 5 IoCs

pid	Process
2116	ea8358576152f09c0ea641691ec51e09_JaffaCakes118.exe
2116	ea8358576152f09c0ea641691ec51e09_JaffaCakes118.exe
2116	ea8358576152f09c0ea641691ec51e09_JaffaCakes118.exe
2468	tmp.exe
2468	tmp.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)	\??\X:	gennt.exe
File opened (read-only)	\??\B:	gennt.exe
File opened (read-only)	\??\K:	gennt.exe
File opened (read-only)	\??\L:	gennt.exe
File opened (read-only)	\??\Q:	gennt.exe
File opened (read-only)	\??\S:	gennt.exe
File opened (read-only)	\??\U:	gennt.exe
File opened (read-only)	\??\V:	gennt.exe
File opened (read-only)	\??\J:	gennt.exe
File opened (read-only)	\??\N:	gennt.exe
File opened (read-only)	\??\P:	gennt.exe
File opened (read-only)	\??\Y:	gennt.exe
File opened (read-only)	\??\Z:	gennt.exe
File opened (read-only)	\??\A:	gennt.exe
File opened (read-only)	\??\E:	gennt.exe
File opened (read-only)	\??\I:	gennt.exe
File opened (read-only)	\??\M:	gennt.exe
File opened (read-only)	\??\R:	gennt.exe
File opened (read-only)	\??\T:	gennt.exe
File opened (read-only)	\??\G:	gennt.exe
File opened (read-only)	\??\H:	gennt.exe
File opened (read-only)	\??\O:	gennt.exe
File opened (read-only)	\??\W:	gennt.exe

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
1900	2492	WerFault.exe	33

System Location Discovery: System Language Discovery 1 TTPs 5 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	ea8358576152f09c0ea641691ec51e09_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	gennt.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	secinit.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2548	gennt.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 2116 wrote to memory of 2468	2116	ea8358576152f09c0ea641691ec51e09_JaffaCakes118.exe	31
PID 2116 wrote to memory of 2468	2116	ea8358576152f09c0ea641691ec51e09_JaffaCakes118.exe	31
PID 2116 wrote to memory of 2468	2116	ea8358576152f09c0ea641691ec51e09_JaffaCakes118.exe	31
PID 2116 wrote to memory of 2468	2116	ea8358576152f09c0ea641691ec51e09_JaffaCakes118.exe	31
PID 2468 wrote to memory of 2548	2468	tmp.exe	32
PID 2468 wrote to memory of 2548	2468	tmp.exe	32
PID 2468 wrote to memory of 2548	2468	tmp.exe	32
PID 2468 wrote to memory of 2548	2468	tmp.exe	32
PID 2548 wrote to memory of 2492	2548	gennt.exe	33
PID 2548 wrote to memory of 2492	2548	gennt.exe	33
PID 2548 wrote to memory of 2492	2548	gennt.exe	33
PID 2548 wrote to memory of 2492	2548	gennt.exe	33
PID 2548 wrote to memory of 2492	2548	gennt.exe	33
PID 2548 wrote to memory of 2492	2548	gennt.exe	33
PID 2548 wrote to memory of 2492	2548	gennt.exe	33
PID 2548 wrote to memory of 2492	2548	gennt.exe	33
PID 2548 wrote to memory of 2492	2548	gennt.exe	33
PID 2548 wrote to memory of 2492	2548	gennt.exe	33
PID 2548 wrote to memory of 2492	2548	gennt.exe	33
PID 2492 wrote to memory of 1900	2492	secinit.exe	34
PID 2492 wrote to memory of 1900	2492	secinit.exe	34
PID 2492 wrote to memory of 1900	2492	secinit.exe	34
PID 2492 wrote to memory of 1900	2492	secinit.exe	34
PID 2548 wrote to memory of 2940	2548	gennt.exe	35
PID 2548 wrote to memory of 2940	2548	gennt.exe	35
PID 2548 wrote to memory of 2940	2548	gennt.exe	35
PID 2548 wrote to memory of 2940	2548	gennt.exe	35

C:\Users\Admin\AppData\Local\Temp\ea8358576152f09c0ea641691ec51e09_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\ea8358576152f09c0ea641691ec51e09_JaffaCakes118.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2116
- C:\Users\Admin\AppData\Local\Temp\tmp.exe
  C:\Users\Admin\AppData\Local\Temp\tmp.exe
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2468
- - C:\ProgramData\906f399eff9916aa9bdf\gennt.exe
    C:\ProgramData\906f399eff9916aa9bdf\gennt.exe "C:\Users\Admin\AppData\Local\Temp\tmp.exe" ensgJJ
    3⤵
    - Modifies WinLogon for persistence
    - Executes dropped EXE
    - Enumerates connected drives
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:2548
  - - C:\Windows\SysWOW64\secinit.exe
      C:\ProgramData\906f399eff9916aa9bdf\gennt.exe
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:2492
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 2492 -s 136
        5⤵
        Program crash
        
        PID:1900
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\906f399eff9916aa9bdf}"
      4⤵
      System Location Discovery: System Language Discovery
      PID:2940

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

System.dll

Path \Users\Admin\AppData\Local\Temp\nstD0B8.tmp\System.dll
Size 11KB
SHA256 6fcea34c8666b06368379c6c402b5321202c11b00889401c743fb96c516c679e
MD5 fccff8cb7a1067e23fd2e2b63971a8e1
SHA1 30e2a9e137c1223a78a0f7b0bf96a1c361976d91
SHA512 f4335e84e6f8d70e462a22f1c93d2998673a7616c868177cac3e8784a3be1d7d0bb96f2583fa0ed82f4f2b6b8f5d9b33521c279a42e055d80a94b4f3f1791e0c
SSDEEP 192:xPtkiQJr7V9r3HcU17S8g1w5xzWxy6j2V7i77blbTc4v:g7VpNo8gmOyRsVc4
MD5 SHA1 SHA512 SSDEEP

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tmp.exe

Path \Users\Admin\AppData\Local\Temp\tmp.exe
Size 120KB
SHA256 44e5ab9cd8b8c02f5c28871cb59c5beb1106e4159e5d4b6aa591335e1b4c6b2f
MD5 5c509d1af9a1e914c2f44f725b391afb
SHA1 e53a38c381e40a02867d280a7363e8becca5a6c3
SHA512 60dc5a4ac44dcc6ad5610c1358afd0d3c01d40d6ffce76b61034212c3c1d557ef91d76f756ceccc44dea7c7d00441296b6aa240954f40100dfecaa1aa95fcfe8
SSDEEP 3072:G2A3MDSSCijJr/w0WGuTRGQaPgr5eBJoB2hNUMhTKJ:G2A8BrRuTRzeKMFKJ
MD5 SHA1 SHA512 SSDEEP

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memory/2468-15-0x0000000000020000-0x000000000002A000-memory.dmp

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memory/2468-16-0x0000000000030000-0x000000000003C000-memory.dmp

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memory/2468-18-0x0000000000030000-0x000000000003C000-memory.dmp

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memory/2468-26-0x0000000000030000-0x000000000003C000-memory.dmp

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memory/2492-42-0x00000000000C0000-0x00000000000C1000-memory.dmp

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memory/2492-40-0x00000000000C0000-0x00000000000C1000-memory.dmp

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memory/2492-38-0x00000000000C0000-0x00000000000C1000-memory.dmp

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memory/2492-36-0x0000000000110000-0x0000000000131000-memory.dmp

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memory/2492-35-0x0000000000110000-0x0000000000131000-memory.dmp

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memory/2492-34-0x0000000000110000-0x0000000000131000-memory.dmp

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memory/2492-33-0x0000000000110000-0x0000000000131000-memory.dmp

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memory/2492-31-0x0000000000110000-0x0000000000131000-memory.dmp

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memory/2548-30-0x0000000000030000-0x000000000003C000-memory.dmp

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memory/2548-28-0x0000000000030000-0x000000000003C000-memory.dmp

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memory/2548-43-0x0000000001340000-0x0000000001361000-memory.dmp

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