formbook | f51db63fe8be8e59e25e8363e5930309e9a9148925e583da18ea7e31bc9b0a96

General

Target

csbdnquus.exe
Size

760KB
MD5

c431847b601038a906219f4429c30bf4
SHA1

2e31eb56b0bc1c655c8d86347398276067f0b15e
SHA256

f51db63fe8be8e59e25e8363e5930309e9a9148925e583da18ea7e31bc9b0a96
SHA512

84c19678c4be4a48c6759a396d93783143972ae0616ab23e6a9bb453c7ecd3c50d7fe0d3e1293e7146023cb4fc2767cbe75bd72ca51d2bb831d5ecb1c9e0104a
SSDEEP

6144:/Bz+lXZtn35VWFiGP8XJD/HobegCAStpL+kmNw0Fq2ecTY668wC1:/sZt35Vy85jubwt5Ln0D3Y4wU

Score

10^/10

formbook 2cur discovery rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

Version

4.1

Campaign

2cur

Decoy

bedsireland.com

ant-coupon.com

dreamsconsultoria.com

ufologypublishing.com

zhenghelab.com

3c-passion-for-furniture.com

ristorantegadir.com

sxcigars.com

moss-solutions.com

uc-work.net

narutocoin.net

alettae.com

sheepnotes.com

stylemefrugal.com

equifaxsefurity2017.com

sanvalentinoday.com

islambrain.com

pahladvisors.net

tekno65.com

bets4affiliates.com

Signatures

Formbook
Formbook is a data stealing malware which is capable of stealing data.
trojan spyware stealer formbook

Formbook payload 4 IoCs

rat

resource	yara_rule
behavioral2/memory/4244-1-0x0000000000EE0000-0x0000000000FA4000-memory.dmp	formbook
behavioral2/memory/3608-13-0x0000000000800000-0x000000000082E000-memory.dmp	formbook
behavioral2/memory/3884-22-0x0000000000400000-0x000000000042E000-memory.dmp	formbook
behavioral2/memory/1636-31-0x0000000000E10000-0x0000000000E3E000-memory.dmp	formbook

Executes dropped EXE 2 IoCs

pid	Process
3608	AddInProcess32.exe
3884	AddInProcess32.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 4244 set thread context of 3608	4244	csbdnquus.exe	73
PID 4244 set thread context of 3884	4244	csbdnquus.exe	76
PID 3884 set thread context of 1908	3884	AddInProcess32.exe	53
PID 1636 set thread context of 1908	1636	wlanext.exe	53

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4008	3608	WerFault.exe	73

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	csbdnquus.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wlanext.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Suspicious behavior: EnumeratesProcesses 13 IoCs

pid	Process
4244	csbdnquus.exe
4244	csbdnquus.exe
4244	csbdnquus.exe
4244	csbdnquus.exe
4244	csbdnquus.exe
3884	AddInProcess32.exe
3884	AddInProcess32.exe
3884	AddInProcess32.exe
3884	AddInProcess32.exe
1636	wlanext.exe
1636	wlanext.exe
1636	wlanext.exe
1636	wlanext.exe

Suspicious behavior: MapViewOfSection 5 IoCs

pid	Process
3884	AddInProcess32.exe
3884	AddInProcess32.exe
3884	AddInProcess32.exe
1636	wlanext.exe
1636	wlanext.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4244	csbdnquus.exe
Token: SeDebugPrivilege	3884	AddInProcess32.exe
Token: SeDebugPrivilege	1636	wlanext.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 4244 wrote to memory of 3608	4244	csbdnquus.exe	73
PID 4244 wrote to memory of 3608	4244	csbdnquus.exe	73
PID 4244 wrote to memory of 3608	4244	csbdnquus.exe	73
PID 4244 wrote to memory of 3608	4244	csbdnquus.exe	73
PID 4244 wrote to memory of 3608	4244	csbdnquus.exe	73
PID 4244 wrote to memory of 3608	4244	csbdnquus.exe	73
PID 4244 wrote to memory of 3884	4244	csbdnquus.exe	76
PID 4244 wrote to memory of 3884	4244	csbdnquus.exe	76
PID 4244 wrote to memory of 3884	4244	csbdnquus.exe	76
PID 4244 wrote to memory of 3884	4244	csbdnquus.exe	76
PID 4244 wrote to memory of 3884	4244	csbdnquus.exe	76
PID 4244 wrote to memory of 3884	4244	csbdnquus.exe	76
PID 1908 wrote to memory of 1636	1908	Explorer.EXE	77
PID 1908 wrote to memory of 1636	1908	Explorer.EXE	77
PID 1908 wrote to memory of 1636	1908	Explorer.EXE	77
PID 1636 wrote to memory of 2696	1636	wlanext.exe	78
PID 1636 wrote to memory of 2696	1636	wlanext.exe	78
PID 1636 wrote to memory of 2696	1636	wlanext.exe	78

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of WriteProcessMemory
PID:1908
- C:\Users\Admin\AppData\Local\Temp\csbdnquus.exe
  "C:\Users\Admin\AppData\Local\Temp\csbdnquus.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4244
- - C:\Users\Admin\AppData\Local\Temp\AddInProcess32.exe
    "C:\Users\Admin\AppData\Local\Temp\AddInProcess32.exe"
    3⤵
    - Executes dropped EXE
    PID:3608
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3608 -s 188
      4⤵
      Program crash
      PID:4008
- - C:\Users\Admin\AppData\Local\Temp\AddInProcess32.exe
    "C:\Users\Admin\AppData\Local\Temp\AddInProcess32.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of AdjustPrivilegeToken
    PID:3884
- C:\Windows\SysWOW64\wlanext.exe
  "C:\Windows\SysWOW64\wlanext.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1636
- - C:\Windows\SysWOW64\cmd.exe
    /c del "C:\Users\Admin\AppData\Local\Temp\AddInProcess32.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2696

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\AddInProcess32.exe

Filesize
41KB

MD5
6a673bfc3b67ae9782cb31af2f234c68

SHA1
7544e89566d91e84e3cd437b9a073e5f6b56566e

SHA256
978a4093058aa2ebf05dc353897d90d950324389879b57741b64160825b5ec0e

SHA512
72c302372ce87ceda2a3c70a6005d3f9c112f1641bc7fe6824c718971233e66c07e2996d2785fa358566c38714c25ea812c05c7cfd2f588284849d495fd24f39

Download Submit
memory/1636-31-0x0000000000E10000-0x0000000000E3E000-memory.dmp

Filesize
184KB

Download
memory/1636-25-0x0000000000F70000-0x0000000000F87000-memory.dmp

Filesize
92KB

Download
memory/1636-27-0x0000000000F70000-0x0000000000F87000-memory.dmp

Filesize
92KB

Download
memory/1636-29-0x0000000000F70000-0x0000000000F87000-memory.dmp

Filesize
92KB

Download
memory/1908-24-0x0000000003250000-0x0000000003325000-memory.dmp

Filesize
852KB

Download
memory/3608-13-0x0000000000800000-0x000000000082E000-memory.dmp

Filesize
184KB

Download
memory/3884-23-0x00000000013E0000-0x00000000013F4000-memory.dmp

Filesize
80KB

Download
memory/3884-20-0x0000000001960000-0x0000000001C80000-memory.dmp

Filesize
3.1MB

Download
memory/3884-22-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/4244-6-0x0000000006530000-0x0000000006A2E000-memory.dmp

Filesize
5.0MB

Download
memory/4244-8-0x00000000731A0000-0x000000007388E000-memory.dmp

Filesize
6.9MB

Download
memory/4244-19-0x00000000731A0000-0x000000007388E000-memory.dmp

Filesize
6.9MB

Download
memory/4244-7-0x0000000006110000-0x00000000061A2000-memory.dmp

Filesize
584KB

Download
memory/4244-10-0x0000000006310000-0x000000000631A000-memory.dmp

Filesize
40KB

Download
memory/4244-0-0x00000000731AE000-0x00000000731AF000-memory.dmp

Filesize
4KB

Download
memory/4244-5-0x00000000731A0000-0x000000007388E000-memory.dmp

Filesize
6.9MB

Download
memory/4244-4-0x00000000731AE000-0x00000000731AF000-memory.dmp

Filesize
4KB

Download
memory/4244-3-0x00000000731A0000-0x000000007388E000-memory.dmp

Filesize
6.9MB

Download
memory/4244-2-0x0000000003150000-0x0000000003164000-memory.dmp

Filesize
80KB

Download
memory/4244-1-0x0000000000EE0000-0x0000000000FA4000-memory.dmp

Filesize
784KB

Download

Analysis

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