formbook | 2f5b7954f66cdc0b94dd0ee4413b8a05a46c753bf4709fa9d3fb3914fe4254d9

General

Target

doc75843.exe
Size

245KB
MD5

765b1bb3690c9bacdfa38e18d788efbf
SHA1

391f2f157ddec18660fa5aa397618c4b44cbca0d
SHA256

a3703cc485d2a99cfec122203ed2d7dd83274af8bd0b3bcfab3fd590dd5c308c
SHA512

057ca24da8f89fbb39921dfd1cf160bea8ead5432277b2e59afcc4894903d5bcb74af7b83c1e985a8ca3dc13e1951dd37f8a2cc898d97688c1dab88afb81feef
SSDEEP

6144:MTqjFAdWMbSChmll5dKk3jQXzk0KX03SfFnEx:MZdWuS3FBjQXzkVX0OEx

Score

10^/10

formbook bk2s discovery rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

Version

4.1

Campaign

bk2s

Decoy

smartchoice.education

sofiaalva.com

angiepologie.com

ohiocommunitynewsnetwork.com

bloodsweatnskills.com

creaturescreate.com

futureadb.com

aimuseums.com

freetimecleaningservices.com

melissadishes.com

xn--tr-trkiye-t9a.com

uxlunexpectedlawyer.com

vinh-heritage.net

cyberzenith.com

zhaigoo.com

flirt-girls.icu

bestivfcenterpune.com

oxbstwnm.icu

chocolatejerky.com

onshore-energy.com

Signatures

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

Formbook payload 3 IoCs

rat

resource	yara_rule
behavioral1/memory/2440-11-0x0000000000400000-0x000000000042E000-memory.dmp	formbook
behavioral1/memory/2440-13-0x0000000000400000-0x000000000042E000-memory.dmp	formbook
behavioral1/memory/2440-17-0x0000000000400000-0x000000000042E000-memory.dmp	formbook

Deletes itself 1 IoCs

pid	Process
2960	cmd.exe

Loads dropped DLL 2 IoCs

pid	Process
2416	doc75843.exe
2416	doc75843.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 2416 set thread context of 2440	2416	doc75843.exe	30
PID 2440 set thread context of 1208	2440	doc75843.exe	21
PID 2440 set thread context of 1208	2440	doc75843.exe	21
PID 2008 set thread context of 1208	2008	systray.exe	21

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

System Information Discovery
T1082

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	doc75843.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	systray.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Suspicious behavior: EnumeratesProcesses 31 IoCs

pid	Process
2440	doc75843.exe
2440	doc75843.exe
2440	doc75843.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe
2008	systray.exe

Suspicious behavior: MapViewOfSection 7 IoCs

pid	Process
2416	doc75843.exe
2440	doc75843.exe
2440	doc75843.exe
2440	doc75843.exe
2440	doc75843.exe
2008	systray.exe
2008	systray.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2440	doc75843.exe
Token: SeDebugPrivilege	2008	systray.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 2416 wrote to memory of 2440	2416	doc75843.exe	30
PID 2416 wrote to memory of 2440	2416	doc75843.exe	30
PID 2416 wrote to memory of 2440	2416	doc75843.exe	30
PID 2416 wrote to memory of 2440	2416	doc75843.exe	30
PID 2416 wrote to memory of 2440	2416	doc75843.exe	30
PID 1208 wrote to memory of 2008	1208	Explorer.EXE	31
PID 1208 wrote to memory of 2008	1208	Explorer.EXE	31
PID 1208 wrote to memory of 2008	1208	Explorer.EXE	31
PID 1208 wrote to memory of 2008	1208	Explorer.EXE	31
PID 2008 wrote to memory of 2960	2008	systray.exe	32
PID 2008 wrote to memory of 2960	2008	systray.exe	32
PID 2008 wrote to memory of 2960	2008	systray.exe	32
PID 2008 wrote to memory of 2960	2008	systray.exe	32

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of WriteProcessMemory
PID:1208
- C:\Users\Admin\AppData\Local\Temp\doc75843.exe
  "C:\Users\Admin\AppData\Local\Temp\doc75843.exe"
  2⤵
  - Loads dropped DLL
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:2416
- - C:\Users\Admin\AppData\Local\Temp\doc75843.exe
    "C:\Users\Admin\AppData\Local\Temp\doc75843.exe"
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of AdjustPrivilegeToken
    PID:2440
- C:\Windows\SysWOW64\systray.exe
  "C:\Windows\SysWOW64\systray.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:2008
- - C:\Windows\SysWOW64\cmd.exe
    /c del "C:\Users\Admin\AppData\Local\Temp\doc75843.exe"
    3⤵
    - Deletes itself
    - System Location Discovery: System Language Discovery
    PID:2960

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

\Users\Admin\AppData\Local\Temp\nso97EE.tmp\System.dll

Filesize
10KB

MD5
56a321bd011112ec5d8a32b2f6fd3231

SHA1
df20e3a35a1636de64df5290ae5e4e7572447f78

SHA256
bb6df93369b498eaa638b0bcdc4bb89f45e9b02ca12d28bcedf4629ea7f5e0f1

SHA512
5354890cbc53ce51081a78c64ba9c4c8c4dc9e01141798c1e916e19c5776dac7c82989fad0f08c73e81aaba332dad81205f90d0663119af45550b97b338b9cc3

Download Submit
memory/1208-14-0x0000000003110000-0x0000000003210000-memory.dmp

Filesize
1024KB

Download
memory/1208-15-0x00000000052B0000-0x00000000053F8000-memory.dmp

Filesize
1.3MB

Download
memory/1208-18-0x00000000052B0000-0x00000000053F8000-memory.dmp

Filesize
1.3MB

Download
memory/1208-19-0x00000000070B0000-0x0000000007252000-memory.dmp

Filesize
1.6MB

Download
memory/1208-25-0x00000000070B0000-0x0000000007252000-memory.dmp

Filesize
1.6MB

Download
memory/2008-22-0x0000000000E60000-0x0000000000E65000-memory.dmp

Filesize
20KB

Download
memory/2008-24-0x0000000000E60000-0x0000000000E65000-memory.dmp

Filesize
20KB

Download
memory/2440-11-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/2440-13-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/2440-17-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download

Analysis

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