formbook | 9469fcaa1fdedbca5dea10fbc8908e549bd80111eebeb817b1f74d6355fdff66

General

Target

EKSTRE.exe
Size

214KB
MD5

36089a492ec3710e15a4b5a0261d249b
SHA1

75e9a0c4ca67ddd2c21353e03a2d80881aca3bc4
SHA256

9469fcaa1fdedbca5dea10fbc8908e549bd80111eebeb817b1f74d6355fdff66
SHA512

834192c31bdbfa43ac8cc32df9911e6aa3854b1a14615f6176b3fbe89298a10367d128a2fb0edb0e81bdb4fcd47fb57f7c3e2d8ae1502bb5d201787d2f8cf5b0
SSDEEP

6144:qweEpm/FpVprq8ELucHE4VS08uIaijEeHd:bQzqikTnbiQ8

Score

10^/10

formbook et02 rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

Version

4.1

Campaign

et02

Decoy

floppa.art

mdesign.solutions

rus8.top

pleasantvilleenclave.com

schweitzervacation.rentals

yaolibeautyme.com

the20-sa.com

hifuel.info

meadowsweetwater.com

squamouscellcarcinoma.site

buildingblmt.com

saberfund.online

letyourstorytalk.com

neinagordon.com

turing.buzz

bouldercityhandyman.net

gethub.online

404wellesleycourt.com

squezpop.com

doublesranch.net

Signatures

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

Formbook payload 3 IoCs

rat

resource	yara_rule
behavioral1/memory/388-65-0x0000000000400000-0x000000000042F000-memory.dmp	formbook
behavioral1/memory/1684-72-0x0000000000080000-0x00000000000AF000-memory.dmp	formbook
behavioral1/memory/1684-76-0x0000000000080000-0x00000000000AF000-memory.dmp	formbook

Executes dropped EXE 2 IoCs

pid	Process
1312	rwwudzwrpr.exe
388	rwwudzwrpr.exe

Loads dropped DLL 2 IoCs

pid	Process
1436	EKSTRE.exe
1312	rwwudzwrpr.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1312 set thread context of 388	1312	rwwudzwrpr.exe	28
PID 388 set thread context of 1192	388	rwwudzwrpr.exe	13
PID 1684 set thread context of 1192	1684	chkdsk.exe	13

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

System Information Discovery
T1082

Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier	chkdsk.exe

Suspicious behavior: EnumeratesProcesses 27 IoCs

pid	Process
388	rwwudzwrpr.exe
388	rwwudzwrpr.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe
1684	chkdsk.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1192	Explorer.EXE

Suspicious behavior: MapViewOfSection 6 IoCs

pid	Process
1312	rwwudzwrpr.exe
388	rwwudzwrpr.exe
388	rwwudzwrpr.exe
388	rwwudzwrpr.exe
1684	chkdsk.exe
1684	chkdsk.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	388	rwwudzwrpr.exe
Token: SeDebugPrivilege	1684	chkdsk.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
1192	Explorer.EXE
1192	Explorer.EXE

Suspicious use of SendNotifyMessage 2 IoCs

pid	Process
1192	Explorer.EXE
1192	Explorer.EXE

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 1436 wrote to memory of 1312	1436	EKSTRE.exe	27
PID 1436 wrote to memory of 1312	1436	EKSTRE.exe	27
PID 1436 wrote to memory of 1312	1436	EKSTRE.exe	27
PID 1436 wrote to memory of 1312	1436	EKSTRE.exe	27
PID 1312 wrote to memory of 388	1312	rwwudzwrpr.exe	28
PID 1312 wrote to memory of 388	1312	rwwudzwrpr.exe	28
PID 1312 wrote to memory of 388	1312	rwwudzwrpr.exe	28
PID 1312 wrote to memory of 388	1312	rwwudzwrpr.exe	28
PID 1312 wrote to memory of 388	1312	rwwudzwrpr.exe	28
PID 1192 wrote to memory of 1684	1192	Explorer.EXE	29
PID 1192 wrote to memory of 1684	1192	Explorer.EXE	29
PID 1192 wrote to memory of 1684	1192	Explorer.EXE	29
PID 1192 wrote to memory of 1684	1192	Explorer.EXE	29
PID 1684 wrote to memory of 1504	1684	chkdsk.exe	30
PID 1684 wrote to memory of 1504	1684	chkdsk.exe	30
PID 1684 wrote to memory of 1504	1684	chkdsk.exe	30
PID 1684 wrote to memory of 1504	1684	chkdsk.exe	30

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1192
- C:\Users\Admin\AppData\Local\Temp\EKSTRE.exe
  "C:\Users\Admin\AppData\Local\Temp\EKSTRE.exe"
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:1436
- - C:\Users\Admin\AppData\Local\Temp\rwwudzwrpr.exe
    "C:\Users\Admin\AppData\Local\Temp\rwwudzwrpr.exe"
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - Suspicious use of SetThreadContext
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of WriteProcessMemory
    PID:1312
  - - C:\Users\Admin\AppData\Local\Temp\rwwudzwrpr.exe
      "C:\Users\Admin\AppData\Local\Temp\rwwudzwrpr.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of SetThreadContext
      Suspicious behavior: EnumeratesProcesses
      Suspicious behavior: MapViewOfSection
      Suspicious use of AdjustPrivilegeToken
      PID:388
- C:\Windows\SysWOW64\chkdsk.exe
  "C:\Windows\SysWOW64\chkdsk.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Enumerates system info in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1684
- - C:\Windows\SysWOW64\cmd.exe
    /c del "C:\Users\Admin\AppData\Local\Temp\rwwudzwrpr.exe"
    3⤵
    PID:1504

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\inbimjtr.u

Filesize
6KB

MD5
d2f51ce7e87ae8f5d164f4858bbd6b45

SHA1
3110065c1bce9d2ed9683832a8c3652ea4b37739

SHA256
9a84491d0cc1b198d79700f089a1b220a844bb80d2e76269d21e4ab609477bdd

SHA512
018db15747d60ef85f173d7d1280ff6dda015f71b6be47986f686bb1dbe7e256b250e9e3c13e03e475bf86e64ee2d4482a3d016cac05f52873a098b0fc67ccf1

Download Submit
C:\Users\Admin\AppData\Local\Temp\rpicdsugyfp.vz

Filesize
185KB

MD5
043c8e17bbc12a9f4b5e4616663b0595

SHA1
a7af266fa00811ef5d25401e5aa6c15f178debd9

SHA256
aab6aab04ff5f6e639dbf39084a338b1332ed3b233fd20bf1c1023b19a6de1c5

SHA512
8755c8f6b322144eba2c8016197df1b97e096bd0c1a27e305ba8f5dc7dd44db66474bf8cac11ac6b410b6f41cacdf852eda282beaeb23d0af5ce3415173ebf9e

Download Submit
C:\Users\Admin\AppData\Local\Temp\rwwudzwrpr.exe

Filesize
5KB

MD5
90767bfc8096035406556162057d9cf2

SHA1
9826c892953d56ce9cd2f5bd9d9bac04318fa8eb

SHA256
4ff7e7524ab6d4ed40e6bb4235f48bec1796e63038c49475b88e572c2b82bf52

SHA512
5a76f9fa025ee2457a5b605bdeb0b263dc2842529d5f95a3e4a13d784c1636d1d366136cf96df4ea082ba5e7c5beb85cd20dad886a1395113f657bb15308c41f

Download Submit
C:\Users\Admin\AppData\Local\Temp\rwwudzwrpr.exe

Filesize
5KB

MD5
90767bfc8096035406556162057d9cf2

SHA1
9826c892953d56ce9cd2f5bd9d9bac04318fa8eb

SHA256
4ff7e7524ab6d4ed40e6bb4235f48bec1796e63038c49475b88e572c2b82bf52

SHA512
5a76f9fa025ee2457a5b605bdeb0b263dc2842529d5f95a3e4a13d784c1636d1d366136cf96df4ea082ba5e7c5beb85cd20dad886a1395113f657bb15308c41f

Download Submit
C:\Users\Admin\AppData\Local\Temp\rwwudzwrpr.exe

Filesize
5KB

MD5
90767bfc8096035406556162057d9cf2

SHA1
9826c892953d56ce9cd2f5bd9d9bac04318fa8eb

SHA256
4ff7e7524ab6d4ed40e6bb4235f48bec1796e63038c49475b88e572c2b82bf52

SHA512
5a76f9fa025ee2457a5b605bdeb0b263dc2842529d5f95a3e4a13d784c1636d1d366136cf96df4ea082ba5e7c5beb85cd20dad886a1395113f657bb15308c41f

Download Submit
\Users\Admin\AppData\Local\Temp\rwwudzwrpr.exe

Filesize
5KB

MD5
90767bfc8096035406556162057d9cf2

SHA1
9826c892953d56ce9cd2f5bd9d9bac04318fa8eb

SHA256
4ff7e7524ab6d4ed40e6bb4235f48bec1796e63038c49475b88e572c2b82bf52

SHA512
5a76f9fa025ee2457a5b605bdeb0b263dc2842529d5f95a3e4a13d784c1636d1d366136cf96df4ea082ba5e7c5beb85cd20dad886a1395113f657bb15308c41f

Download Submit
\Users\Admin\AppData\Local\Temp\rwwudzwrpr.exe

Filesize
5KB

MD5
90767bfc8096035406556162057d9cf2

SHA1
9826c892953d56ce9cd2f5bd9d9bac04318fa8eb

SHA256
4ff7e7524ab6d4ed40e6bb4235f48bec1796e63038c49475b88e572c2b82bf52

SHA512
5a76f9fa025ee2457a5b605bdeb0b263dc2842529d5f95a3e4a13d784c1636d1d366136cf96df4ea082ba5e7c5beb85cd20dad886a1395113f657bb15308c41f

Download Submit
memory/388-65-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download
memory/388-66-0x00000000008C0000-0x0000000000BC3000-memory.dmp

Filesize
3.0MB

Download
memory/388-67-0x0000000000350000-0x0000000000364000-memory.dmp

Filesize
80KB

Download
memory/1192-75-0x0000000006ED0000-0x0000000007019000-memory.dmp

Filesize
1.3MB

Download
memory/1192-68-0x0000000004E80000-0x0000000004FD7000-memory.dmp

Filesize
1.3MB

Download
memory/1192-77-0x0000000006ED0000-0x0000000007019000-memory.dmp

Filesize
1.3MB

Download
memory/1436-54-0x0000000075711000-0x0000000075713000-memory.dmp

Filesize
8KB

Download
memory/1684-73-0x0000000001F00000-0x0000000002203000-memory.dmp

Filesize
3.0MB

Download
memory/1684-72-0x0000000000080000-0x00000000000AF000-memory.dmp

Filesize
188KB

Download
memory/1684-74-0x0000000001D60000-0x0000000001DF3000-memory.dmp

Filesize
588KB

Download
memory/1684-76-0x0000000000080000-0x00000000000AF000-memory.dmp

Filesize
188KB

Download
memory/1684-71-0x00000000004C0000-0x00000000004C7000-memory.dmp

Filesize
28KB

Download

Analysis

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