formbook | 371a7fde3d56ab06c051efdd78f55fa6a142360de778646d24f713b9097048e1

General

Target

Muestras.exe
Size

513KB
MD5

2ea863b6b81bb910cacf7ad6562438d3
SHA1

13f5dbf1f7ba7191b41ca1aea3d18035709f6744
SHA256

371a7fde3d56ab06c051efdd78f55fa6a142360de778646d24f713b9097048e1
SHA512

8461ebefd23f850522cac453d33e533d1a208ca43e8a5fa328bc99a67c9726724aa7ff23232e14a77a52fe0dff25efd08338af6359b221cfc1eefdd89384e00d

Score

10^/10

formbook bs2l rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

Version

4.1

Campaign

bs2l

C2

http://www.amazonsfinds.com/bs2l/

Decoy

file-anae.com

letsgosunderland.com

urgome.com

g5tet.xyz

myline2online.com

crafty-buck.com

uralpack.net

chinmeat.com

kursuskekipoh.com

justgantt.com

hqh.xyz

xiongege55.com

pokebrostogo.com

firststonemusic.com

bataviabento.com

comoditahandyshop.com

dayloniabeauty.com

ceeonec.com

scribblerhub.com

lindosueno.com

Signatures

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

Formbook Payload 4 IoCs

rat

Processes:

resource	yara_rule
behavioral1/memory/1564-63-0x0000000000400000-0x000000000042E000-memory.dmp	formbook
behavioral1/memory/1564-64-0x000000000041EB40-mapping.dmp	formbook
behavioral1/memory/1564-69-0x0000000000400000-0x000000000042E000-memory.dmp	formbook
behavioral1/memory/1700-75-0x0000000000080000-0x00000000000AE000-memory.dmp	formbook

Suspicious use of SetThreadContext 4 IoCs

Processes:

Muestras.exeRegSvcs.exemsdt.exe

description	pid	process	target process
PID 964 set thread context of 1564	964	Muestras.exe	RegSvcs.exe
PID 1564 set thread context of 1360	1564	RegSvcs.exe	Explorer.EXE
PID 1564 set thread context of 1360	1564	RegSvcs.exe	Explorer.EXE
PID 1700 set thread context of 1360	1700	msdt.exe	Explorer.EXE

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
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
T1053

Processes:

schtasks.exe

pid process

1404 schtasks.exe

pid	process
1404	schtasks.exe

Suspicious behavior: EnumeratesProcesses 18 IoCs

Processes:

RegSvcs.exemsdt.exe

pid	process
1564	RegSvcs.exe
1564	RegSvcs.exe
1564	RegSvcs.exe
1700	msdt.exe
1700	msdt.exe
1700	msdt.exe
1700	msdt.exe
1700	msdt.exe
1700	msdt.exe
1700	msdt.exe
1700	msdt.exe
1700	msdt.exe
1700	msdt.exe
1700	msdt.exe
1700	msdt.exe
1700	msdt.exe
1700	msdt.exe
1700	msdt.exe

Suspicious behavior: MapViewOfSection 6 IoCs

Processes:

RegSvcs.exemsdt.exe

pid process

1564 RegSvcs.exe
1564 RegSvcs.exe
1564 RegSvcs.exe
1564 RegSvcs.exe
1700 msdt.exe
1700 msdt.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

RegSvcs.exemsdt.exe

description pid process

Token: SeDebugPrivilege 1564 RegSvcs.exe
Token: SeDebugPrivilege 1700 msdt.exe
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

Explorer.EXE

pid process

1360 Explorer.EXE
1360 Explorer.EXE
Suspicious use of SendNotifyMessage 2 IoCs

Processes:

Explorer.EXE

pid process

1360 Explorer.EXE
1360 Explorer.EXE

description	pid	process
Token: SeDebugPrivilege	1564	RegSvcs.exe
Token: SeDebugPrivilege	1700	msdt.exe

pid	process
1360	Explorer.EXE
1360	Explorer.EXE

pid	process
1360	Explorer.EXE
1360	Explorer.EXE

Suspicious use of WriteProcessMemory 22 IoCs

Processes:

Muestras.exeExplorer.EXEmsdt.exe

description	pid	process	target process
PID 964 wrote to memory of 1404	964	Muestras.exe	schtasks.exe
PID 964 wrote to memory of 1404	964	Muestras.exe	schtasks.exe
PID 964 wrote to memory of 1404	964	Muestras.exe	schtasks.exe
PID 964 wrote to memory of 1404	964	Muestras.exe	schtasks.exe
PID 964 wrote to memory of 1564	964	Muestras.exe	RegSvcs.exe
PID 964 wrote to memory of 1564	964	Muestras.exe	RegSvcs.exe
PID 964 wrote to memory of 1564	964	Muestras.exe	RegSvcs.exe
PID 964 wrote to memory of 1564	964	Muestras.exe	RegSvcs.exe
PID 964 wrote to memory of 1564	964	Muestras.exe	RegSvcs.exe
PID 964 wrote to memory of 1564	964	Muestras.exe	RegSvcs.exe
PID 964 wrote to memory of 1564	964	Muestras.exe	RegSvcs.exe
PID 964 wrote to memory of 1564	964	Muestras.exe	RegSvcs.exe
PID 964 wrote to memory of 1564	964	Muestras.exe	RegSvcs.exe
PID 964 wrote to memory of 1564	964	Muestras.exe	RegSvcs.exe
PID 1360 wrote to memory of 1700	1360	Explorer.EXE	msdt.exe
PID 1360 wrote to memory of 1700	1360	Explorer.EXE	msdt.exe
PID 1360 wrote to memory of 1700	1360	Explorer.EXE	msdt.exe
PID 1360 wrote to memory of 1700	1360	Explorer.EXE	msdt.exe
PID 1700 wrote to memory of 1824	1700	msdt.exe	cmd.exe
PID 1700 wrote to memory of 1824	1700	msdt.exe	cmd.exe
PID 1700 wrote to memory of 1824	1700	msdt.exe	cmd.exe
PID 1700 wrote to memory of 1824	1700	msdt.exe	cmd.exe

C:\Users\Admin\AppData\Local\Temp\Muestras.exe
"C:\Users\Admin\AppData\Local\Temp\Muestras.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:964

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\eGWSVRxsBoYDt" /XML "C:\Users\Admin\AppData\Local\Temp\tmpC1C9.tmp"
2⤵
- Creates scheduled task(s)
PID:1404

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe"
2⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
PID:1564

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1360

C:\Windows\SysWOW64\msdt.exe
"C:\Windows\SysWOW64\msdt.exe"
2⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1700

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe"
3⤵
PID:1824

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

memory/964-57-0x0000000004BF0000-0x0000000004BF1000-memory.dmp

Filesize
4KB

Download
memory/964-58-0x0000000000540000-0x0000000000547000-memory.dmp

Filesize
28KB

Download
memory/964-59-0x0000000004D10000-0x0000000004D5F000-memory.dmp

Filesize
316KB

Download
memory/964-55-0x00000000003D0000-0x00000000003D1000-memory.dmp

Filesize
4KB

Download
memory/1360-68-0x0000000006A40000-0x0000000006B61000-memory.dmp

Filesize
1.1MB

Download
memory/1360-79-0x00000000040E0000-0x00000000041A1000-memory.dmp

Filesize
772KB

Download
memory/1360-71-0x0000000007000000-0x000000000714A000-memory.dmp

Filesize
1.3MB

Download
memory/1404-60-0x0000000000000000-mapping.dmp

Download
memory/1564-61-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/1564-63-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/1564-64-0x000000000041EB40-mapping.dmp

Download
memory/1564-66-0x0000000000AE0000-0x0000000000DE3000-memory.dmp

Filesize
3.0MB

Download
memory/1564-69-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/1564-70-0x00000000002F0000-0x0000000000304000-memory.dmp

Filesize
80KB

Download
memory/1564-62-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/1564-67-0x00000000001A0000-0x00000000001B4000-memory.dmp

Filesize
80KB

Download
memory/1700-72-0x0000000000000000-mapping.dmp

Download
memory/1700-74-0x00000000003C0000-0x00000000004B4000-memory.dmp

Filesize
976KB

Download
memory/1700-75-0x0000000000080000-0x00000000000AE000-memory.dmp

Filesize
184KB

Download
memory/1700-77-0x0000000002310000-0x0000000002613000-memory.dmp

Filesize
3.0MB

Download
memory/1700-73-0x0000000075F41000-0x0000000075F43000-memory.dmp

Filesize
8KB

Download
memory/1700-78-0x0000000002040000-0x00000000020D3000-memory.dmp

Filesize
588KB

Download
memory/1824-76-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads