formbook | f637d170a539b7418c9da3506bc437edd21c854313fc7a2a4b03f675a63a4ae1

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
01-09-2024 00:40

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General

Target

teklif.exe
Size

378KB
MD5

9f5f0a9318f01aba5f2e413cf55f30ee
SHA1

2893ad78ba028cd19eec0634babf210e86b2b3c5
SHA256

3b098abf608b9def35a0cabf2e548dfe01d4f575f6406770be29a25439785978
SHA512

05695b9d5b70c758069d17386910b6c9a70a852557e7dc03f4827d923ef6680c81a24bad662e04cf3f3179d548fa4ed711355ce2b12f703b675da9f0fae58fc8
SSDEEP

6144:ryO/Zh4o9pb4K0gUjJfeanDlgy+3IvVfgupuW9hioiYnWcEzkIdUND1tUabGgxP0:rBZh4ebmjpegJ+CVfguPibk/Nxtnagx8

Score

10^/10

formbook rs26 credential_access discovery persistence rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

Version

4.1

Campaign

rs26

Decoy

amazon-review.info

17kaihuiba.com

timeableholdings.com

techvestorsmultifamily.com

rokketsoftware.com

abbigliamentoagricolo.com

artjiayi.com

smooouse.com

lightcastwired.com

bravuad.com

mr133.com

clubfitdartmouth.com

masturbation-stories.net

yedekparcatreni.com

pureologyrising.com

goodsystem2updating.download

fn4pk8p0o5.com

climatechangersofny.com

shuangxian023.com

lxiuot.men

Signatures

Formbook
Formbook is a data stealing malware which is capable of stealing data.
trojan spyware stealer formbook
Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
credential_access stealer

Credentials from Web Browsers
T1555.003

Formbook payload 2 IoCs

rat

resource	yara_rule
behavioral2/memory/3616-15-0x0000000000400000-0x000000000042D000-memory.dmp	formbook
behavioral2/memory/3616-20-0x0000000000400000-0x000000000042D000-memory.dmp	formbook

Adds policy Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	chkdsk.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\SHXHH4MXCR = "C:\\Program Files (x86)\\Odxqlef\\colorcplezmxj.exe"	chkdsk.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-355097885-2402257403-2971294179-1000\Control Panel\International\Geo\Nation	teklif.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 592 set thread context of 3616	592	teklif.exe	104
PID 3616 set thread context of 3552	3616	RegSvcs.exe	56
PID 2336 set thread context of 3552	2336	chkdsk.exe	56

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Odxqlef\colorcplezmxj.exe	chkdsk.exe

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 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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	teklif.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	chkdsk.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

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

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\Registry\User\S-1-5-21-355097885-2402257403-2971294179-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	chkdsk.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
1628	schtasks.exe

Suspicious behavior: EnumeratesProcesses 52 IoCs

pid	Process
592	teklif.exe
592	teklif.exe
592	teklif.exe
592	teklif.exe
592	teklif.exe
592	teklif.exe
592	teklif.exe
592	teklif.exe
592	teklif.exe
592	teklif.exe
3616	RegSvcs.exe
3616	RegSvcs.exe
3616	RegSvcs.exe
3616	RegSvcs.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe

Suspicious behavior: MapViewOfSection 7 IoCs

pid	Process
3616	RegSvcs.exe
3616	RegSvcs.exe
3616	RegSvcs.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe
2336	chkdsk.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	592	teklif.exe
Token: SeDebugPrivilege	3616	RegSvcs.exe
Token: SeDebugPrivilege	2336	chkdsk.exe
Token: SeShutdownPrivilege	3552	Explorer.EXE
Token: SeCreatePagefilePrivilege	3552	Explorer.EXE
Token: SeShutdownPrivilege	3552	Explorer.EXE
Token: SeCreatePagefilePrivilege	3552	Explorer.EXE

Suspicious use of UnmapMainImage 1 IoCs

pid	Process
3552	Explorer.EXE

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 592 wrote to memory of 1628	592	teklif.exe	99
PID 592 wrote to memory of 1628	592	teklif.exe	99
PID 592 wrote to memory of 1628	592	teklif.exe	99
PID 592 wrote to memory of 4660	592	teklif.exe	101
PID 592 wrote to memory of 4660	592	teklif.exe	101
PID 592 wrote to memory of 4660	592	teklif.exe	101
PID 592 wrote to memory of 2900	592	teklif.exe	102
PID 592 wrote to memory of 2900	592	teklif.exe	102
PID 592 wrote to memory of 2900	592	teklif.exe	102
PID 592 wrote to memory of 4600	592	teklif.exe	103
PID 592 wrote to memory of 4600	592	teklif.exe	103
PID 592 wrote to memory of 4600	592	teklif.exe	103
PID 592 wrote to memory of 3616	592	teklif.exe	104
PID 592 wrote to memory of 3616	592	teklif.exe	104
PID 592 wrote to memory of 3616	592	teklif.exe	104
PID 592 wrote to memory of 3616	592	teklif.exe	104
PID 592 wrote to memory of 3616	592	teklif.exe	104
PID 592 wrote to memory of 3616	592	teklif.exe	104
PID 3552 wrote to memory of 2336	3552	Explorer.EXE	105
PID 3552 wrote to memory of 2336	3552	Explorer.EXE	105
PID 3552 wrote to memory of 2336	3552	Explorer.EXE	105
PID 2336 wrote to memory of 3144	2336	chkdsk.exe	106
PID 2336 wrote to memory of 3144	2336	chkdsk.exe	106
PID 2336 wrote to memory of 3144	2336	chkdsk.exe	106
PID 2336 wrote to memory of 3804	2336	chkdsk.exe	113
PID 2336 wrote to memory of 3804	2336	chkdsk.exe	113
PID 2336 wrote to memory of 3804	2336	chkdsk.exe	113
PID 2336 wrote to memory of 4900	2336	chkdsk.exe	118
PID 2336 wrote to memory of 4900	2336	chkdsk.exe	118
PID 2336 wrote to memory of 4900	2336	chkdsk.exe	118

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of UnmapMainImage
- Suspicious use of WriteProcessMemory
PID:3552
- C:\Users\Admin\AppData\Local\Temp\teklif.exe
  "C:\Users\Admin\AppData\Local\Temp\teklif.exe"
  2⤵
  - Checks computer location settings
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:592
- - C:\Windows\SysWOW64\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\hhdPPNCtb" /XML "C:\Users\Admin\AppData\Local\Temp\tmp7A5B.tmp"
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1628
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
    "{path}"
    3⤵
    PID:4660
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
    "{path}"
    3⤵
    PID:2900
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
    "{path}"
    3⤵
    PID:4600
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
    "{path}"
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of AdjustPrivilegeToken
    PID:3616
- C:\Windows\SysWOW64\chkdsk.exe
  "C:\Windows\SysWOW64\chkdsk.exe"
  2⤵
  - Adds policy Run key to start application
  - Suspicious use of SetThreadContext
  - Drops file in Program Files directory
  - System Location Discovery: System Language Discovery
  - Enumerates system info in registry
  - Modifies Internet Explorer settings
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2336
- - C:\Windows\SysWOW64\cmd.exe
    /c del "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:3144
- - C:\Windows\SysWOW64\cmd.exe
    /c copy "C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Login Data" "C:\Users\Admin\AppData\Local\Temp\DB1" /V
    3⤵
    - System Location Discovery: System Language Discovery
    PID:3804
- - C:\Program Files\Mozilla Firefox\Firefox.exe
    "C:\Program Files\Mozilla Firefox\Firefox.exe"
    3⤵
    PID:4900

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\DB1

Filesize
40KB

MD5
a182561a527f929489bf4b8f74f65cd7

SHA1
8cd6866594759711ea1836e86a5b7ca64ee8911f

SHA256
42aad7886965428a941508b776a666a4450eb658cb90e80fae1e7457fc71f914

SHA512
9bc3bf5a82f6f057e873adebd5b7a4c64adef966537ab9c565fe7c4bb3582e2e485ff993d5ab8a6002363231958fabd0933b48811371b8c155eaa74592b66558

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp7A5B.tmp

Filesize
1KB

MD5
c6f1c735bb5ce4c153f17b3344df67a3

SHA1
beeaaad9cb12e02306ddf2b4add3a723bedc6d86

SHA256
41ccd406848e45f1051a6d5d4428f5dd8dd5420c552487908c164bf3ef2b52f5

SHA512
cd64dc46e0b7978f1f0d7ca3d1eb1ff1c87d19d9cf3d03b67993aba6c03ce0e5967409d61f25029e1f1abc6bc8a3d74d4c6b3a860dc4762e6f102460f594f823

Download Submit
C:\Users\Admin\AppData\Roaming\4PNN4O-F\4PNlogim.jpeg

Filesize
75KB

MD5
eed2b6dc650921150a48c339c3c974b1

SHA1
725acd18a70823f8b26d5f9f8b424fc3647cef89

SHA256
ea27e53db5ec9fcb907ef2fb54087cacf9f9a656cee20c7190e053042f280438

SHA512
4293b50f824732042f92b7b43bf3236c69d27c42990959342c5e3bf647d7d9e0e2bfbd6be12d802fa9a7cdaa7a7e5962c57796165761ea2e3b982bb28306573e

Download Submit
C:\Users\Admin\AppData\Roaming\4PNN4O-F\4PNlogrf.ini

Filesize
40B

MD5
2f245469795b865bdd1b956c23d7893d

SHA1
6ad80b974d3808f5a20ea1e766c7d2f88b9e5895

SHA256
1662d01a2d47b875a34fc7a8cd92e78cb2ba7f34023c7fd2639cbb10b8d94361

SHA512
909f189846a5d2db208a5eb2e7cb3042c0f164caf437e2b1b6de608c0a70e4f3510b81b85753dbeec1e211e6a83e6ea8c96aff896e9b6e8ed42014473a54dc4f

Download Submit
C:\Users\Admin\AppData\Roaming\4PNN4O-F\4PNlogrg.ini

Filesize
38B

MD5
4aadf49fed30e4c9b3fe4a3dd6445ebe

SHA1
1e332822167c6f351b99615eada2c30a538ff037

SHA256
75034beb7bded9aeab5748f4592b9e1419256caec474065d43e531ec5cc21c56

SHA512
eb5b3908d5e7b43ba02165e092f05578f45f15a148b4c3769036aa542c23a0f7cd2bc2770cf4119a7e437de3f681d9e398511f69f66824c516d9b451bb95f945

Download Submit
C:\Users\Admin\AppData\Roaming\4PNN4O-F\4PNlogri.ini

Filesize
40B

MD5
d63a82e5d81e02e399090af26db0b9cb

SHA1
91d0014c8f54743bba141fd60c9d963f869d76c9

SHA256
eaece2eba6310253249603033c744dd5914089b0bb26bde6685ec9813611baae

SHA512
38afb05016d8f3c69d246321573997aaac8a51c34e61749a02bf5e8b2b56b94d9544d65801511044e1495906a86dc2100f2e20ff4fcbed09e01904cc780fdbad

Download Submit
C:\Users\Admin\AppData\Roaming\4PNN4O-F\4PNlogrv.ini

Filesize
872B

MD5
bbc41c78bae6c71e63cb544a6a284d94

SHA1
33f2c1d9fa0e9c99b80bc2500621e95af38b1f9a

SHA256
ee83c6bcea9353c74bfc0a7e739f3c4a765ace894470e09cdcdebba700b8d4cb

SHA512
0aea424b57adae3e14ad6491cab585f554b4dffe601b5a17bad6ee6177d2f0f995e419cde576e2d1782b9bddc0661aada11a2c9f1454ae625d9e3223635ec9f4

Download Submit
memory/592-17-0x0000000074B40000-0x00000000752F0000-memory.dmp

Filesize
7.7MB

Download
memory/592-0-0x0000000074B4E000-0x0000000074B4F000-memory.dmp

Filesize
4KB

Download
memory/592-9-0x0000000074B40000-0x00000000752F0000-memory.dmp

Filesize
7.7MB

Download
memory/592-10-0x0000000009130000-0x0000000009188000-memory.dmp

Filesize
352KB

Download
memory/592-11-0x00000000091B0000-0x00000000091E2000-memory.dmp

Filesize
200KB

Download
memory/592-7-0x0000000007D50000-0x0000000007D5A000-memory.dmp

Filesize
40KB

Download
memory/592-1-0x0000000000E40000-0x0000000000EA4000-memory.dmp

Filesize
400KB

Download
memory/592-8-0x0000000074B4E000-0x0000000074B4F000-memory.dmp

Filesize
4KB

Download
memory/592-2-0x0000000008230000-0x00000000087D4000-memory.dmp

Filesize
5.6MB

Download
memory/592-3-0x0000000007D60000-0x0000000007DF2000-memory.dmp

Filesize
584KB

Download
memory/592-4-0x0000000074B40000-0x00000000752F0000-memory.dmp

Filesize
7.7MB

Download
memory/592-5-0x00000000031D0000-0x00000000031DA000-memory.dmp

Filesize
40KB

Download
memory/592-6-0x00000000093F0000-0x000000000948C000-memory.dmp

Filesize
624KB

Download
memory/2336-24-0x0000000000CD0000-0x0000000000CDA000-memory.dmp

Filesize
40KB

Download
memory/2336-23-0x0000000000CD0000-0x0000000000CDA000-memory.dmp

Filesize
40KB

Download
memory/3552-30-0x0000000008770000-0x00000000088B6000-memory.dmp

Filesize
1.3MB

Download
memory/3552-29-0x0000000008770000-0x00000000088B6000-memory.dmp

Filesize
1.3MB

Download
memory/3552-32-0x0000000008770000-0x00000000088B6000-memory.dmp

Filesize
1.3MB

Download
memory/3552-25-0x0000000002BF0000-0x0000000002D01000-memory.dmp

Filesize
1.1MB

Download
memory/3552-22-0x0000000002BF0000-0x0000000002D01000-memory.dmp

Filesize
1.1MB

Download
memory/3616-20-0x0000000000400000-0x000000000042D000-memory.dmp

Filesize
180KB

Download
memory/3616-21-0x0000000000E20000-0x0000000000E34000-memory.dmp

Filesize
80KB

Download
memory/3616-18-0x0000000000EE0000-0x000000000122A000-memory.dmp

Filesize
3.3MB

Download
memory/3616-15-0x0000000000400000-0x000000000042D000-memory.dmp

Filesize
180KB

Download